Coronavirus and COVID-19: What People With Cancer Need to Know

December 5, 2021
Merry Jennifer Markham, MD, FACP, FASCO

eHealthcare Leadership Awards 2021 - WinnerThis post is reviewed every day and updated as needed. It was first published on March 3, 2020. It received the award of Distinction from the eHealthcare Awards in the Best COVID-19 Pandemic Related Communications category.

Merry Jennifer Markham, MD, FACP, FASCO, is Chief of the University of Florida (UF) Division of Hematology & Oncology, a Clinical Professor in the UF College of Medicine, and the Associate Director for Medical Affairs at the UF Health Cancer Center. She specializes in the treatment of gynecologic cancers. Dr. Markham is the Cancer.Net Associate Editor for Gynecologic Cancers and the past chair of ASCO's Cancer Communications Committee. Follow her on Twitter at @DrMarkham.

The American Society of Clinical Oncology (ASCO) is aware that people with cancer and cancer survivors, particularly those with compromised immune systems, are likely worried about the potential impact of COVID-19 on their health. Patients should talk with their oncologists and health care teams to discuss their options to protect themselves from infection.

What do I need to know about COVID-19 vaccines?

There are several COVID-19 vaccines that are now in use in different parts of the world. In the United States, the 3 vaccines in use are made by Pfizer BioNTech, Moderna, and Janssen, manufactured by Johnson & Johnson. Globally, other vaccines are available or are in process of receiving Emergency Use Listing by the World Health Organization (WHO).

For COVID-19 vaccines that are 2-dose vaccines, both doses are recommended to ensure full vaccination. The U.S. Food and Drug Administration (FDA) authorized the use of “mix and match” booster doses on October 20, 2021, and this was approved by the U.S. Centers for Disease Control and Prevention (CDC). For example, someone who received the initial vaccination series with the Moderna vaccine could receive a booster dose of the Pfizer vaccine.

  • Pfizer. In the United States, the Pfizer vaccine has received emergency use authorization from the FDA for use in people 5 years of age or older and, on August 23, 2021, full FDA authorization for the vaccine in people 16 and older. It is administered in 2 doses, 3 weeks apart. A third, booster dose was first approved only for high-risk adults. However, on November 19, 2021, the FDA authorized and the CDC approved booster doses for all adults. The booster dose may be given 6 months after the second dose of the original vaccination series.

    If you have been treated for cancer and have questions about whether you should receive a booster dose, speak with your oncologist.

  • Moderna. The Moderna vaccine is authorized for use in people 18 years of age or older and is administered in 2 doses, 1 month apart. A third (booster) dose of this vaccine was originally authorized by the FDA and recommended by the CDC for people who are at high risk of complications from COVID-19. However, the FDA expanded the recommendation, supported by the CDC, to allow a booster dose to be given at least 6 months after the second dose of the original Moderna series to all adults.

  • Johnson & Johnson. The Johnson & Johnson vaccine is a single-dose vaccine and is authorized for individuals 18 and older. According to the FDA and the CDC, a booster dose of this vaccine may be given to adults 18 and older at least 2 months after receiving the original dose.

The available COVID-19 vaccines are effective against most variants of the virus, including the Delta variant. However, variants may still cause illness in some people who are vaccinated.

There are plenty of vaccine doses available in the United States. You can find COVID-19 vaccines near you by searching, checking with major retail pharmacies, or calling 1-800-232-0233. Vaccine distribution varies from country to country. Check your local or national health department to learn more about how vaccines are being distributed in your area.

If you have more questions about the vaccine, you can find answers at (Note that this link will take you to a separate website.)

Side effects. The most common expected side effects of the Pfizer and Moderna vaccines include pain at the injection site, tiredness, muscle pain, headache, chills, joint pain, and fever. Side effects should be expected, and these side effects go away within 3 days. Side effects are sometimes worse with the second dose, but again, these side effects should go away within 3 days. If you still have side effects more than 3 days after your vaccine dose, let your doctor know.

One rare side effect of 2-shot COVID-19 vaccines is swelling of the lymph nodes in the armpit, which could be mistaken as a sign of breast cancer. Because of this unusual side effect, delay your mammogram for at least 1 month after receiving the COVID-19 vaccine.

The most common side effects of the Johnson & Johnson vaccine were pain at the injection site, headache, fatigue, muscle aches, and nausea. Most of these side effects were mild to moderate in severity and lasted 1 to 2 days.

Data on unexpected side effects of these vaccines are being collected and monitored. When something uncommon happens, this information is reported to the FDA and CDC so that further investigations may be performed. For example, 6 people (out of more than 6.8 million people) who received the Johnson & Johnson vaccine were reported to have a rare type of blood clot. Because of this, administration of that vaccine was briefly paused so that these cases could be reviewed and the relationship to the vaccine could be determined. This does not mean that the vaccine is dangerous. Pauses like this are an important and expected safety mechanism in the development of any new medications or vaccines.

Safety in people with cancer. Experts agree that the COVID-19 vaccine is recommended for people with cancer, cancer survivors, and those currently on cancer treatment, including chemotherapy and immunotherapy. The best available evidence suggests the odds of dying or experiencing severe complications from COVID-19 are roughly 2 times higher if you are someone with cancer than a person without cancer. The only people who should not be offered the vaccine are those who may have a harmful reaction, such as anaphylaxis, to a specific vaccine component. Talk with your doctor or your cancer care team about whether a COVID-19 vaccine is recommended for you, based on your own medical history. Your doctor will also have more information, over time, about when a vaccine is available for you. Read an FAQ about the COVID-19 vaccine and how it relates to people with cancer. (This link takes you to a different ASCO website.)

The COVID-19 vaccine studies included people with medical conditions such as chronic lung disease, diabetes, and obesity, but they did not include people with cancer or those receiving cancer treatment. This means that the efficacy of the vaccine in people with cancer or those undergoing cancer treatment is unknown at this time.

Despite the lack of information on the safety of COVID-19 vaccines in people with cancer, many vaccinations are recommended for people with cancer, including the pneumococcal pneumonia vaccine and the flu vaccine. Some vaccines are OK to receive during cancer treatment, when the immune system is weak, but some vaccines, such as live virus vaccines, should not be given during cancer treatment. The COVID-19 vaccine is not a live virus vaccine.

After you are fully vaccinated. Once you have been fully vaccinated, the CDC recommends that you can resume activities that you did before the pandemic, without wearing a mask or physically distancing, except in areas of the United States were the spread of the Delta variant is substantial or high. In those areas, wearing a mask indoors in public is recommended. (You can view the level of community spread in your county on the CDC website.) In most cases, individuals are not fully vaccinated against COVID-19 until 2 weeks after their final dose of the vaccine. However, in some areas, you may still be required to wear a mask and keep physically distant, such as in hospitals or clinics, public transportation, and others. Also, some local, state, or federal laws may still require these precautions. Be sure to see what precautions will still be required in your area by checking with your local government.

No vaccine is 100% effective, and sometimes, vaccinated people can still get COVID-19, which is called a “breakthrough infection.” The risk of this is very low, and vaccinated people are unlikely to become very ill. If you have cancer or are receiving cancer treatment or have other medical conditions that put you at high risk for illness from COVID-19, you should consider continuing to wear a mask when you are indoors in public settings. Check with your doctor for specific guidance if you feel you are at higher risk for complications from COVID-19.  

The virus will remain in the community until the majority of residents are vaccinated, so these precautions are critical to preventing continued spread of the virus, especially with more contagious variants circulating.

What is COVID-19?

COVID-19, or coronavirus disease 2019, is an illness caused by a novel (or new) coronavirus that was first identified in an outbreak in Wuhan, China, in December 2019. 

Coronaviruses are a large family of viruses that can cause mild illnesses, such as the common cold, to more severe diseases, such as Severe Acute Respiratory Syndrome (SARS) and Middle East Respiratory Syndrome (MERS). Because the novel coronavirus is related to the SARS-associated coronavirus (SARS-CoV), the virus has been named SARS-CoV-2. The exact source of SARS-CoV-2, which causes COVID-19, is not certain but likely originated in bats.

The virus can spread from person to person, through small droplets from the nose or mouth that are produced when a person coughs or sneezes. Another person may catch COVID-19 by breathing in these droplets or by touching a surface that the droplets have landed on and then touching their eyes, nose, or mouth. The virus spreads through close contact, but it mainly spreads by airborne transmission. In an enclosed space, virus particles can remain in the air for minutes to hours and can infect people at distances of more than 6 feet (2 meters).

Symptoms from COVID-19 can be mild to severe and may appear between 2 and 14 days after exposure to the virus. The symptoms may include fever, cough, shortness of breath, chills, headaches, sore throat, and new loss of taste or smell. Other symptoms may include aches and pains, fatigue, nasal congestion or runny nose, or diarrhea. In some people, the illness may cause severe pneumonia and heart problems, and it may lead to death. Other people who are infected may not develop any symptoms.

COVID-19 can occur in both children and adults. Children with COVID-19 are also at risk for a multisystem inflammatory syndrome, with symptoms such as rash, fever, abdominal pain, vomiting, and diarrhea. Initial reports indicated that children and young adults were not as affected by COVID-19. However, people of all ages, including infants, can die from this disease. In addition, deaths seem to occur disproportionately in diverse populations, including Black and Hispanic populations.

An analysis of 928 people with cancer and COVID-19 presented during the ASCO20 Virtual Scientific Program revealed that having active, progressing cancer was associated with a 5 times higher risk of dying within 30 days compared with patients who were in remission from cancer.

Viruses commonly change over time through mutation, and several variants of the SARS-CoV-2 virus have been identified. For example, the Delta variant of the virus was identified in December 2020 in India, then in the United Kingdom, and is now dominant in many countries, including the United States. The Delta variant spreads more easily from person to person, but it is not known whether it is more deadly. Unvaccinated people are most at risk of getting this variant.

What can I do to avoid getting COVID-19?

Three vaccines have received emergency use authorization from the FDA, and one of those (Pfizer) has received formal FDA approval for ages 16 and up. Data collection from clinical trials to test the effectiveness of COVID-19 vaccines are still ongoing. These trials will give scientists valuable information that can help patients and the general public in the long run. If you would like to participate in a COVID-19 vaccine clinical trial, has a full listing of available studies.

The most important way to protect yourself is to be vaccinated against COVID-19. If you are not vaccinated, stay at home as much as possible and avoid areas where people gather. Follow guidance on travel restrictions issued by the CDC or the World Health Organization (WHO).

Washing your hands for at least 20 seconds is an important way to protect yourself and prevent transmission of the virus. If soap and water are not available, use hand sanitizer that contains at least 60% alcohol. 

In addition to washing your hands frequently, it’s important to:

  • Avoid touching your eyes, nose, and mouth.

  • If you must cough or sneeze, use a tissue. Then throw the tissue away. Or, cough or sneeze into your elbow rather than your hand.

  • Avoid close contact with people who are sick.

  • Regularly clean frequently touched objects and surfaces.

  • If there has been a known COVID-19 exposure, then cleaning with disinfectant wipes or spray is important.

If you are not vaccinated against COVID-19 and are in public, it is important to wear a mask or cloth face covering that covers the nose and mouth. This can help prevent the spread of COVID-19 in the community, especially because some people with COVID-19 have no symptoms and don’t know they have the virus, or they may not have yet developed symptoms. You should not wear masks with exhalation valves or vents because the vents allow your own respiratory droplets to leave the mask and can put others at risk. Double masking, such as wearing a cloth mask or nylon face covering over a surgical mask, is more effective at limiting transmission of the virus than wearing only 1 mask. The CDC recommends double masking, rather than just wearing 1 mask. If you only wear 1 mask, it should be tight fitting around the nose and mouth.

Wearing a face mask does not replace social or physical distancing. If you are out in public and not vaccinated, you should do both: practice physical distancing of at least 6 feet (2 meters) from other people and wear a mask.

If you are vaccinated but living or traveling in an area with high transmission rates of COVID-19, you should continue to wear a mask when indoors in public settings. If you are at high risk for COVID-19 illness or complications due to your cancer treatment or other medical condition, you should also continue to wear a mask in these settings.

There is no scientific evidence that taking zinc or vitamin C, even at high doses, can help to prevent COVID-19. Using mouthwash and nasal rinses, or ingesting mouthwash in large amounts, also will not prevent COVID-19 and can be dangerous. Drinking or gargling with betadine or other iodine products is dangerous and does not help prevent or treat COVID-19.

Are there special precautions that people with cancer should take?

People with cancer, people who are in active cancer treatment, older patients, and people with other serious chronic medical conditions, such as lung disease, diabetes, or heart disease, are at higher risk for the more severe form of COVID-19 that could lead to death. Studies have shown that people with active or progressing cancer may be at higher risk than those whose cancer is in remission. The same rules apply for people with cancer as for those without cancer: Be sure to wash your hands well. Avoid touching your face, and avoid close contact with people who are sick.

People who are at higher risk of getting very sick from COVID-19 should think carefully about non-essential travel during the COVID-19 pandemic, especially if the travel will involve areas with high or increasing rates of COVID-19. This is especially important for people who have not yet been fully vaccinated against COVID-19. If you are not vaccinated, stay at home to reduce your exposure to the virus, practice physical distancing, and avoid social gatherings, including smaller gatherings with family or friends who don't live with you. Wear a cloth face covering or mask, and make your trip out as brief as possible. If you have been vaccinated and live in an area with low COVID-19 transmission rates, you are able to return to normal activities. In places with high or increasing rates of COVID-19, masking is still important. Always follow local government guidelines for masking and social distancing.

If you are vaccinated, outdoor activities are generally safe without physical distancing. If you are not vaccinated, walking or exercising outdoors is fine as long as the area is not crowded and you are able to keep a distance of at least 6 feet (2 meters) from other people.

A good rule of thumb during emergency situations such as the pandemic is to keep enough essential medications, both prescription and over-the-counter, to last for at least 1 month. Create and keep updated an emergency contact list that includes family, friends, neighbors, and community or neighborhood resources who may be able to provide information or assistance to you if you need it.

To stay connected to your support system, connect with your family and friends virtually, through video chats or phone calls. Some examples of technology that can be used for video or other live chats are FaceTime, Zoom, Google Hangouts, and social media platforms, such as Instagram and Facebook.

If you are scheduled for cancer treatments, have a discussion with your oncologist about the benefits and risks of continuing or delaying treatment. If you are not scheduled for cancer treatment but are scheduled for an appointment with your oncologist, it may be possible for the doctor to conduct the visit using videoconferencing or telemedicine. Be sure to check with your cancer care team to see if this is recommended for you.

Finally, it is always important to have your health care wishes in writing, in case you are too sick to make decisions for yourself. This way, your family and your medical team will know what is important to you and what your wishes are. If you have not yet done this, now is a good time. Cancer.Net has valuable information on this topic. Because some hospitals and clinics are limiting visitors, and some are allowing no visitors, having your health care wishes in writing is more important than ever. Here are some examples of important questions to ask yourself, to discuss with your loved ones, and to write down:

  • What level of quality of life would be unacceptable to me?

  • What are my most important goals if my health situation worsens?

  • If I am unable to speak for myself, who is the person in my life who I would want to speak for me?

  • Who should not be involved in making decisions for me?

  • If my heart stops, do I want to have CPR (cardiopulmonary resuscitation) done?

Will anything change with my cancer-related medical visits?

Due to the COVID-19 pandemic and the increased risk of exposure to the virus, most hospitals and clinics have changed their visitation policies. Some may allow 1 visitor per patient, and others may allow no visitors. Masks and physical distancing are still required in health-care settings. Before heading to your medical appointment, check with the clinic or hospital for their current visitor policy.

Your cancer care team may conduct some of your appointments by telemedicine. During a telemedicine appointment, you can stay at home and visit with your doctor or other health care team member through video conferencing using your phone or computer. Your doctor’s office will give you instructions on how to have your visit this way. If you are interested in having a visit by telemedicine rather than in person, ask your doctor's office staff if this is possible. 

If community spread of COVID-19 in your area is high, your doctor may recommend delaying some treatments for supportive care, such as bone-strengthening treatments, for example, denosumab (Xgeva) or zoledronic acid (Zometa), or intravenous iron supplementation. They will only recommend delaying treatments if they feel it is in your best interest to do so. 

Early in the pandemic, cancer screening tests, such as mammograms or colonoscopies, and other tests, such as bone density tests, were often delayed to reduce your risk of exposure to the virus. However, it is still important to receive regular cancer screening, even during a pandemic. The Prevent Cancer Foundation’s Back on the Books website can help you learn more about COVID-19 and safe cancer screening. 

For people who are at high risk of cancer, such as those with a hereditary cancer syndrome like Lynch Syndrome or a BRCA mutation, your doctor may recommend delaying some cancer risk-reducing procedures. They will only recommend this if they feel it's safest for you, based on the virus transmission rates where you live and your own personal risk. It's always best to discuss timing of these tests and procedures with your doctor.

What should I do if I think I may have COVID-19?

Call ahead before visiting your health care professional or the emergency department if you have a fever and other symptoms of a respiratory illness, such as cough and shortness of breath. Let them know if you think you may have COVID-19. They will ask you questions about your symptoms, travel history, exposure, vaccination history, and medical risk factors. They will then give you instructions on how to get tested in your community. You may also be able to get tested for COVID-19 at local testing centers or pharmacies in your community without a doctor’s order. It is important to note that even if you are vaccinated, you may still develop COVID-19, but the risk is lower and the illness is more likely to be mild.

A common question I hear from patients is about which doctor to call. I recommend calling the doctor who you have the most contact with. If you have been off cancer treatment for more than a year and are seeing your primary care provider regularly, you may call your primary care provider. However, if you are seeing your oncologist more regularly or are on active cancer treatment, call your oncologist.

If you are receiving cancer treatment that suppresses the immune system and you develop a fever and respiratory symptoms, call your oncologist as you usually would if you develop a fever while on treatment. Be sure to follow their guidance on when to come into the office or hospital and when it’s safer to stay home.

Severe symptoms could be a medical emergency, and you may need to call 911. If you or your loved one has symptoms, such as trouble breathing, persistent pain or pressure in your chest, new confusion, or bluish lips, you should seek medical attention immediately.

Testing for COVID-19 involves inserting a 6-inch-long swab, similar to a Q-tip, deep into the nasal cavity for at least 15 seconds. The swab is inserted into a special container and sent to a laboratory for testing. Saliva tests are also available in some areas. There are several FDA-approved at-home self-collection kits for this virus, approved under an emergency-use authorization. These tests often include a medical screening questionnaire and up-front payment, and the samples are sent to a lab for testing. The FDA has also given emergency use authorization to an over-the-counter, at-home test that can give results in about 20 minutes. This test involves a nasal swab that can detect fragments of the virus, if they are present. You should discuss with your doctor whether these are the right tests for you. If you decide to take an at-home test, be sure to let your cancer care team know the results.

If it is possible that you have COVID-19, you should stay at home and isolate yourself while you are tested and waiting for your test results. Staying home when you are sick is the best way to prevent transmitting the novel coronavirus and other respiratory viruses, such as the flu, to other people. If you live with someone, you should quarantine yourself in one part of the home, if possible, to lower the risk of spreading the virus to the rest of the people who live with you.

If you are concerned that you’ve been exposed to someone with COVID-19, closely watch for developing symptoms. Check your temperature regularly for fevers. If you have active cancer or are currently in cancer treatment, let your medical team know about your possible exposure.

On June 3, 2020, a study was published in the New England Journal of Medicine that included 821 people with no symptoms of COVID-19 who had a household or work exposure to COVID-19. This study showed that treatment with hydroxychloroquine after an exposure to someone with COVID-19 did not provide any benefit.

Is there a way to find out if I have already had COVID-19?

Antibody tests, also known as serologic tests, have been developed, and these tests may be able to find out if you have already had a COVID-19 infection by identifying whether there are antibodies in the blood. Antibodies are specific proteins made by the body in response to an infection.

Antibody tests are not perfect. Some people who get COVID-19 may not make antibodies. Or they may make very low levels of antibodies. Some people may have a “false positive” antibody test, meaning the test finds antibodies, but the antibodies are related to a different coronavirus and not COVID-19.

Antibody tests should not be used to make a current diagnosis of COVID-19. It can take between 1 and 3 weeks after the infection for the body to make antibodies.

If you have had a COVID-19 infection, whether diagnosed through a test for the virus or through an antibody test, it is possible (but not certain) that you may have immunity for about 3 months. However, if suspicious symptoms develop within that 3-month period after the COVID-19 infection, another test for COVID-19 is recommended, unless there is another obvious cause for those symptoms.

If I have had COVID-19, will I be able to continue cancer treatment?

If you have tested positive for COVID-19, you should have a discussion with your oncologist about the impact of this on your cancer treatment. Some cancer treatment centers may require a negative COVID-19 test before chemotherapy or other cancer treatment starts again. However, some patients with COVID-19 continue to test positive even after recovering from their symptoms. In this situation, your health care team will consider the risks and benefits of restarting cancer treatment despite the positive test. Some treatments, especially those that do not impair the immune system, may be able to continue, especially if you have tested positive for the virus but do not have symptoms or have only mild symptoms.

When your cancer treatment resumes or continues after COVID-19, it is important to wear a mask when coming to the infusion clinic or cancer treatment center and to practice good hand hygiene by using hand sanitizer or handwashing before and after visits.

Are there any treatments available for COVID-19?

There are no cures for COVID-19. Scientists continue to work hard to develop and test treatments for COVID-19. Clinical trials are research studies that involve people. Clinical trials for potential COVID-19 treatments are now open in many locations in the United States and in other countries. If you have been diagnosed with the coronavirus disease and you join a clinical trial for patients with COVID-19, you may be able to receive these medications. Also, by joining a clinical trial, your participation will help scientists find the most effective and safe treatment for the illness. The NCI COVID-19 in Cancer Patients Study (NCCAPS) and a study at Stanford, for example, are designed to collect symptoms from people who may have COVID-19 to help researchers learn the course of the disease and help find a treatment.  

For people with cancer and COVID-19 that is not severe, monoclonal antibodies may be helpful in reducing the chances that the illness becomes severe and reducing the need for hospitalization. The combination of casirivimab and imdevimab (made by Regeneron Pharmaceuticals, Inc.) were given FDA emergency use authorization on November 21, 2020, for the treatment of mild or moderate COVID-19 in patients who are at high risk for developing more severe disease. This antibody combination is given intravenously as a single 1,200 mg infusion. Sotrovimab (made by GlaxoSmithKline) received emergency use authorization for use in mild to moderate COVID-19 in people age 12 and older who are at high risk for progression to severe COVID-19.

The combination of bamlanivimab and etesevimab, an intravenous monoclonal antibody therapy, was originally given emergency use authorization for the treatment of mild to moderate COVID-19 in people 12 years of age and older. However, because of the prevalence of variants, including the Delta variant, and the ineffectiveness of this combination against those variants, distribution of this therapy was paused in June 2021.

For people who have just become symptomatic with COVID-19 and are at high risk for progression to severe COVID-19, treatment with monoclonal antibody therapy should be given as soon as possible after the diagnosis.

For outpatient treatment of COVID-19, there is not enough data to support other outpatient treatments such as convalescent plasma or dexamethasone. Hydroxychloroquine is not recommended for the treatment of COVID-19, either alone or in combination with any other drugs. Ivermectin should not be used as a treatment for COVID-19.

For people in the hospital due to COVID-19, treatments may include a variety of measures, depending on the severity of the illness. For example, people in the hospital who are not yet on oxygen may be given the antiviral medication remdesivir. For people who are sick enough to need supplemental oxygen, dexamethasone (a steroid) may be added. Other medications that physicians in the hospital may use for very sick patients include baricitinib (a Janus kinase inhibitor) or tociluzumab (a medication that targets the immune system’s interleukin-6 pathway). The primary treatment is supportive care, including oxygen and supporting breathing through mechanical ventilation, if necessary.

Remdesivir, an antiviral medication, may be helpful in treating COVID-19 infections. The drug received an Emergency Use Authorization from the FDA on May 1, 2020, and became the first FDA-approved treatment for COVID-19 on October 23, 2020. Remdesivir is approved for patients with COVID-19 who require hospitalization. It may decrease time spent hospitalized but does not prevent death.

Dexamethasone, a steroid medication, can be beneficial for critically ill patients with COVID-19. A report from the U.K. Recovery Trial found that dexamethasone can help save lives in people who require oxygen therapy or are on a ventilator. In this population of very ill patients, receiving dexamethasone resulted in a lower rate of death at 28 days. The drug unfortunately does not seem to help in cases of mild disease.

Convalescent plasma is the liquid portion of blood that can be collected from people who have recovered from COVID-19. This plasma may have antibodies to SARS-CoV-2. Convalescent plasma is being studied in clinical trials as a possible treatment, and the FDA issued an Emergency Use Authorization for it on August 23, 2020. However, its benefits and risks still have not been confirmed in randomized clinical trials.

Hydroxychloroquine (Plaquenil) initially seemed promising as a possible treatment for COVID-19, but after various clinical trials reported data on its safety and effectiveness, this medication was not found to be helpful.

A version of chloroquine (chloroquine phosphate) is used as an additive to clean fish aquariums. Consuming this fish tank additive has led to at least 1 death and other overdoses. Do not consume this product—it can kill you.

Drinking bleach or injecting bleach or other household disinfectants is very dangerous and can kill you. Another proposed treatment to avoid is oleandrin, an extract that comes from a toxic shrub. Ingesting even a small amount of the plant can kill you. These are not treatments for COVID-19, and they will not help prevent it.

Do not take ivermectin, a drug used to treat parasites and head lice. Ivermectin products are made differently for animals and for humans. Ivermectin is not an antiviral medication. Taking this medication has not been shown to be helpful in treating COVID-19. Consuming it, especially at doses recommended for animals, can be dangerous and may result in overdose, hospitalization, and death.

How do we attend school or work safely?

Around the world, there is variation in whether or not schools and offices are open for in-person attendance. In the United States, local and state officials have worked with school systems to plan school openings. Some schools are offering only in-person education, a small number of schools are completely virtual, and others still are offering some blend of the two.

If you or your children are returning to school in person, and especially if you are not vaccinated against COVID-19, wearing a face covering or mask that covers the nose and mouth at all times is important to lower the risk of spread. If physical distancing is possible, please do so. Use hand sanitizer frequently and wash hands whenever possible. Stay home or keep children at home if they are sick or have a fever.

When returning to in-person work, the same rules apply. Being vaccinated against COVID-19 is the safest approach. If you are not vaccinated, avoid large gatherings of people, physical distance as much as possible, and wear a mask at all times. Regularly clean desks and other frequently touched surfaces. If there has been a known exposure to COVID-19 in the space, then cleaning with disinfectant wipes is important. Do not go to work when you are sick or if you have a fever.

Finally, be sure to get a flu shot during flu season. This can help protect you and those around you.

When will things return to normal?

The rates of infection from the virus have fluctuated since early 2020, but the virus has not gone away and it likely won’t anytime soon. Overall, in the United States, the number of cases of COVID-19 and the number of deaths from the virus have continued to increase, though rates fluctuate in various communities and countries. With COVID-19 vaccines now widely available in the United States, a return to normal is expected, but access to vaccines varies from country to country. Also, unless a high percentage of people choose to be vaccinated, a return to normal will be significantly delayed. Masking and physical distancing continue to be important, especially indoors in areas of high COVID-19 transmission, for those who are at higher risk because of medical conditions or immune suppression, and for those who are not yet vaccinated or not fully vaccinated. Masks will likely continue to be required in health-care settings.

If your local community, county, or state allows nonessential businesses to be open and if you are not vaccinated against COVID-19, the safest approach is to continue to stay at home and avoid being in public as much as possible. Wear face masks and consider double masking when you leave your home. Stay at least 6 feet (2 meters) away from other people.

If you decide to eat at a restaurant, it’s safest to eat outside, and you should still wear a mask if you are not vaccinated, unless you are eating or drinking. People who are vaccinated can feel more comfortable resuming pre-pandemic activities, such as dining in a restaurant and shopping.

Many people believe that a negative COVID-19 test means that it’s safe to gather with friends or family members outside of your household. However, this is not true. It is important to remember that a negative COVID-19 test only means that the person was negative at the moment of that test. The test only gives information about the level of virus at the exact time of the test. Someone could have COVID-19 but not yet have enough virus to test positive. Also, these tests are not 100% accurate.

The safest approach, especially if you are considered high risk and if you are not vaccinated, is to continue living as if the stay-at-home restrictions are still in place. If you have been vaccinated, it is now possible to ease back into social events. But if you are in an area of high COVID-19 transmission, wearing a mask indoors is recommended.

If you have questions about your personal risk due to your cancer or cancer treatment, be sure to speak with your doctor for their guidance.

Where can I get the latest information about COVID-19?

Staying up to date on the latest information on the COVID-19 outbreak is important. The CDC and your local and state health departments will have ongoing information about whether the disease has been diagnosed in your community.

This information is also available in Spanish, Portuguese, Russian, and Arabic (PDF).

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