Coronaviruses are a family of viruses that can cause illnesses such as the common cold, severe acute respiratory syndrome (SARS) and Middle East respiratory syndrome (MERS). In 2019, a new coronavirus was identified as the cause of a disease outbreak that originated in China.
The virus is known as severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The disease it causes is called coronavirus disease 2019 (COVID-19). In March 2020, the World Health Organization (WHO) declared the COVID-19 outbreak a pandemic.
Public health groups, including the U.S. Centers for Disease Control and Prevention (CDC) and WHO, are monitoring the COVID-19 pandemic and posting updates on their websites. These groups have also issued recommendations for preventing and treating the virus that causes COVID-19.
Signs and symptoms of coronavirus disease 2019 (COVID-19) may appear 2 to 14 days after exposure. This time after exposure and before having symptoms is called the incubation period. You can still spread COVID-19 before you have symptoms (presymptomatic transmission). Common signs and symptoms can include:
Early symptoms of COVID-19 may include a loss of taste or smell.
Other symptoms can include:
This list isn't complete. Children have similar symptoms to adults and generally have mild illness.
The severity of COVID-19 symptoms can range from very mild to severe. Some people may have only a few symptoms. Some people may have no symptoms at all, but can still spread it (asymptomatic transmission). Some people may experience worsened symptoms, such as worsened shortness of breath and pneumonia, about a week after symptoms start.
Some people experience COVID-19 symptoms for more than four weeks after they're diagnosed. These health issues are sometimes called post-COVID-19 conditions. Some children experience multisystem inflammatory syndrome, a syndrome that can affect some organs and tissues, several weeks after having COVID-19. Rarely, some adults experience the syndrome too.
People who are older have a higher risk of serious illness from COVID-19, and the risk increases with age. People who have existing medical conditions also may have a higher risk of serious illness. Certain medical conditions that may increase the risk of serious illness from COVID-19 include:
This list is not complete. Other medical conditions may increase your risk of serious illness from COVID-19.
If you have COVID-19 signs or symptoms or you've been in contact with someone diagnosed with COVID-19, contact your health care provider right away for medical advice. Your health care provider will likely recommend that you get tested for COVID-19. If you have emergency COVID-19 symptoms, such as trouble breathing, seek care immediately. If you need to go to a hospital, call ahead so that health care providers can take steps to ensure that others aren't exposed.
If you have emergency COVID-19 signs and symptoms, seek care immediately. Emergency signs and symptoms can include:
This list isn't complete. Let your health care provider know if you are an older adult or have chronic medical conditions, such as heart disease or lung disease, as you may have a greater risk of becoming seriously ill with COVID-19.
Infection with severe acute respiratory syndrome coronavirus 2, or SARS-CoV-2, causes coronavirus disease 2019 (COVID-19).
The virus that causes COVID-19 spreads easily among people. Data has shown that the COVID-19 virus spreads mainly from person to person among those in close contact (within about 6 feet, or 2 meters). The virus spreads by respiratory droplets released when someone with the virus coughs, sneezes, breathes, sings or talks. These droplets can be inhaled or land in the mouth, nose or eyes of a person nearby.
Sometimes the COVID-19 virus can spread when a person is exposed to very small droplets or aerosols that stay in the air for several minutes or hours — called airborne transmission.
The virus can also spread if you touch a surface with the virus on it and then touch your mouth, nose or eyes. But the risk is low.
The COVID-19 virus can spread from someone who is infected but has no symptoms. This is called asymptomatic transmission. The COVID-19 virus can also spread from someone who is infected but hasn't developed symptoms yet. This is called presymptomatic transmission.
It's possible to get COVID-19 twice or more, but this is uncommon.
The COVID-19 virus has mutated several times and now has several variants that are being monitored in the United States. The delta (B.1.617.2) variant is a variant of concern in the U.S. and is more contagious than previous variants.
Risk factors for COVID-19 appear to include:
Although most people with COVID-19 have mild to moderate symptoms, the disease can cause severe medical complications and lead to death in some people. Older adults or people with existing medical conditions are at greater risk of becoming seriously ill with COVID-19.
Complications can include:
The U.S. Food and Drug Administration (FDA) has given emergency use authorization to some COVID-19 vaccines in the United States. The FDA has approved the Pfizer-BioNTech COVID-19 vaccine, now called Comirnaty, to prevent COVID-19 in people age 16 and older. The FDA has given emergency use authorization to Pfizer-BioNTech COVID-19 vaccines for ages 5 through 15.
A vaccine can prevent you from getting the COVID-19 virus or prevent you from becoming seriously ill if you get the COVID-19 virus. In addition, COVID-19 vaccination might offer better protection than getting sick with COVID-19. A recent study showed that unvaccinated people who already had COVID-19 are more than twice as likely as fully vaccinated people to get reinfected with COVID-19.
Also, if you are fully vaccinated, you can more safely return to many activities you may not have been able to do because of the pandemic. If you are in an area with a high number of new COVID-19 cases in the last week, the CDC recommends wearing a mask indoors in public and outdoors in crowded areas or when you are in close contact with unvaccinated people. If you are fully vaccinated and have a condition or are taking medications that weaken your immune system, you may need to keep wearing a mask.
An additional dose of a COVID-19 vaccine is recommended for people who are fully vaccinated and might not have had a strong enough immune response. In contrast, a booster dose is recommended for some people who are fully vaccinated and whose immune response weakened over time.
The CDC recommends additional doses and booster doses of COVID-19 vaccines in specific instances:
Additional dose. The CDC recommends a third dose of an mRNA COVID-19 vaccine for some people with weakened immune systems, such as those who have had an organ transplant. People with weakened immune systems might not develop enough immunity after vaccination with two doses of an mRNA COVID-19 vaccine. An additional dose might improve their protection against COVID-19.
The third dose should be given at least 28 days after a second dose of an mRNA COVID-19 vaccine. The additional dose should be the same brand as the other two mRNA COVID-19 vaccine doses you were given. If the brand given isn't known, either brand of mRNA COVID-19 vaccine can be given as a third dose.
Booster dose. If you are age 18 or older, have been given both doses of the Pfizer-BioNTech COVID-19 vaccine or the Moderna COVID-19 vaccine and it’s been at least 6 months, you can get a single booster dose.
If you are age 18 or older, have been given one dose of the Janssen/Johnson & Johnson COVID-19 vaccine and it’s been at least 2 months, you can get a single booster dose.
Pregnant women may also receive a booster dose.
You may choose which vaccine you get as a booster dose. You can get a booster dose that is the same brand as your previous shot or shots or choose a different brand.
If you haven’t had the COVID-19 vaccine, you can take many steps to reduce your risk of infection from the COVID-19 virus and reduce the risk of spreading it to others. WHO and CDC recommend following these precautions:
If you have a chronic medical condition and may have a higher risk of serious illness, check with your doctor about other ways to protect yourself.
If you're planning to travel, first check the CDC and WHO websites for updates and advice. Be prepared to wear a mask and use appropriate hand hygiene when in public. You may also want to talk with your health care provider if you have health conditions that make you more susceptible to respiratory infections and complications.
If you develop symptoms of coronavirus disease 2019 (COVID-19) or you've been exposed to the COVID-19 virus, contact your health care provider. Also let your health care provider know if you've had close contact with anyone who has been diagnosed with COVID-19.
Factors used to decide whether to test you for the virus that causes COVID-19 may differ depending on where you live. Depending on your location, you may need to be screened by your clinic to determine if testing is appropriate and available.
In the U.S., your health care provider will determine whether to conduct tests for the virus that causes COVID-19 based on your signs and symptoms, as well as whether you have had close contact with someone diagnosed with COVID-19. Your health care provider may also consider testing if you are at higher risk of serious illness or you are going to have a medical procedure. If you have had close contact with someone with COVID-19 but you've had COVID-19 in the past three months, you don’t need to be tested. If you’ve been fully vaccinated and you’ve had close contact with someone with COVID-19, get tested 5 to 7 days after you’ve had contact with them.
To test for the COVID-19 virus, a health care provider takes a sample from the nose (nasopharyngeal swab), throat (throat swab) or saliva. The samples are then sent to a lab for testing. If you're coughing up sputum, that may be sent for testing. The FDA has authorized at-home tests for the COVID-19 virus. These are available only with a doctor's prescription.
Currently, only one medication has been approved to treat COVID-19. No cure is available for COVID-19. Antibiotics aren't effective against viral infections such as COVID-19. Researchers are testing a variety of possible treatments.
The FDA has approved the antiviral drug remdesivir (Veklury) to treat COVID-19 in hospitalized adults and children who are age 12 and older in the hospital.
The FDA has granted an emergency use authorization for the rheumatoid arthritis drug baricitinib (Olumiant) to treat COVID-19 in some cases. Baricitinib is a pill that seems to work against COVID-19 by reducing inflammation and having antiviral activity. The FDA states baricitinib may be used in people who are hospitalized with COVID-19 who are on mechanical ventilators or need supplemental oxygen.
Several monoclonal antibody medications are available. These include sotrovimab and a combination of two antibodies called casirivimab and imdevimab. These drugs are used to treat mild to moderate COVID-19 in people who have a higher risk of developing serious illness due to COVID-19. Treatment involves a single intravenous infusion given in an outpatient setting. To be most effective, these medications need to be given soon after COVID-19 symptoms start and prior to hospitalization.
The FDA has also authorized the use of casirivimab and imdevimab as a treatment for people at higher risk of serious illness who have recently been exposed to the COVID-19 virus or who are at high risk of exposure. For example, people at high risk of exposure may include those living in nursing homes or prisons where others have recently been infected with the COVID-19 virus. This treatment is for people who aren't fully vaccinated, or who are fully vaccinated but have a weakened immune system.
The U.S. National Institutes of Health has recommended the corticosteroid dexamethasone for people hospitalized with severe COVID-19 who are on supplemental oxygen or need mechanical ventilation. Other corticosteroids, such as prednisone, methylprednisolone or hydrocortisone, may be used if dexamethasone isn't available.
The FDA has also granted emergency use authorization for convalescent plasma therapy with high antibody levels to treat COVID-19. Convalescent plasma is blood donated by people who've recovered from COVID-19. Convalescent plasma with high antibodies may be used to treat some hospitalized people ill with COVID-19 who are either early in their illness or who have weakened immune systems.
Many people with COVID-19 may have mild illness and can be treated with supportive care. Supportive care is aimed at relieving symptoms and may include:
There is no evidence that ibuprofen or other nonsteroidal anti-inflammatory drugs (NSAIDs) need to be avoided.
If you have mild symptoms, your health care provider will likely recommend that you recover at home. You may be given special instructions to monitor your symptoms and to avoid spreading the illness to others. You'll likely be asked to isolate yourself as much as possible from family and pets while you're sick, wear a mask when you're around people and pets, and use a separate bedroom and bathroom.
Your health care provider will likely recommend that you stay in home isolation for a period of time except to get medical care. Your health care provider will likely follow up with you regularly. Follow guidelines from your health care provider and local health department about when you can end home isolation.
If you're very ill, you may need to be treated in the hospital.
It's common to feel fearful and anxious during the COVID-19 pandemic. You're probably worried that you or those you love will get sick. You may be concerned about taking care of yourself or others who are ill.
During this time, remember to take care of yourself and manage your stress.
If you're ill with COVID-19, it's especially important to:
Having COVID-19 or caring for someone with the disease can cause stress and anxiety. If stress is affecting your daily life after several days, contact your health care provider and consider requesting a referral to a mental health professional.
To be treated for COVID-19, you may start by seeing your primary care doctor or other health care provider. Or you may be referred immediately to a doctor trained in treating infectious diseases. If you think you have COVID-19, tell your health care provider before going in. The health care provider and medical team can then:
Here's some information to help you get ready for your appointment.
When you make the appointment, ask if there's anything you need to do in advance. Make a list of:
Take a family member or friend along, if possible, to help you remember the information you're given. Avoid bringing more than one or two people. Check before you go to the appointment, as your hospital or clinic may have visitor restrictions.
Some basic questions to ask your health care provider include:
Your health care provider is likely to ask you several questions, such as:
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