Coronavirus Disease (COVID-19)
What You Need to Know About Coronavirus Disease (COVID-19)
For the most updated information visit: The CDC Coronavirus Page.
What You Should Know
What is coronavirus disease 2019 (COVID-19)?
Coronavirus disease 2019 (COVID-19) is a respiratory illness that can spread from person to person. The virus that causes COVID-19 is a novel coronavirus that was first identified during an investigation into an outbreak in Wuhan, China.
Have there been cases of COVID-19 in the U.S.?
Yes. The first case of COVID-19 in the United States was reported on January 21, 2020. The current count of cases of COVID-19 in the United States is available on CDC’s webpage at CDC list of US Coronavirus Cases..
How does COVID-19 spread?
The virus that causes COVID-19 probably emerged from an animal source, but now it seems to be spreading from person to person. It’s important to note that person-to-person spread can happen on a continuum. Some diseases are highly contagious (like measles), while other diseases are less so. Learn what is known about the spread of newly emerged coronaviruses at CDC information about Coronavirus Transmission.
What are the symptoms of COVID-19?
Patients with COVID-19 have had mild to severe respiratory illness with symptoms of
- shortness of breath
What are severe complications from this virus?
Many patients have pneumonia in both lungs.
How can I help protect myself?
The best way to prevent infection is to avoid being exposed to the virus that causes COVID-19.
There are simple everyday preventive actions to help prevent the spread of respiratory viruses. These include:
- Avoid close contact with people who are sick.
- Avoid touching your eyes, nose, and mouth with unwashed hands.
- Wash your hands often with soap and water for at least 20 seconds.
- Use an alcohol-based hand sanitizer that contains at least 60% alcohol if soap and water are not available.
If you are sick, to keep from spreading respiratory illness to others, you should:
- Stay home when you are sick.
- Cover your cough or sneeze with a tissue, then throw the tissue in the trash.
- Clean and disinfect frequently touched objects and surfaces.
Is there a vaccine?
There is currently no vaccine to protect against COVID-19. The best way to prevent infection is to avoid being exposed to the virus that causes COVID-19.
Is there a treatment?
There is no specific antiviral treatment for COVID-19. People with COVID-19 can seek medical care to help relieve symptoms.
Who is at higher risk?
Early information shows that some people are at higher risk of getting very sick from this illness. This includes:
- Older adults
- People who have serious chronic medical conditions like heart disease, diabetes, lung disease.
If you are at higher risk because of your age or because you have a serious long-term health problem, it is extra important to take actions to reduce the risk of getting sick with the disease. If you are at higher risk of getting sick from COVID-19, you should:
- Stock up on supplies
- Take every day precautions to keep space between yourself and others.
- When you go out in public, keep away from others who are sick, limit close contact and wash your hands often.
- Avoid crowds as much as possible.
- Avoid cruise travel and non-essential air travel.
- Reduce your risk of being exposed.
Frequently Asked Questions
Q: What is a novel coronavirus?
A: A novel coronavirus is a new coronavirus that has not been previously identified. The virus causing coronavirus disease 2019 (COVID-19), is not that same as the coronaviruses that commonly circulate among humans and cause mild illness, like the common cold.
A diagnosis with coronavirus 229E, NL63, OC43, or HKU1 is not the same as a COVID-19 diagnosis. Patients with COVID-19 will be evaluated and cared for differently than patients with common coronavirus diagnosis.
Q: Why is the disease causing the outbreak now being called coronavirus disease 2019, COVID-19?
A: On February 11, 2020 the World Health Organization announced an official name for the disease that is causing the 2019 novel coronavirus outbreak, first identified in Wuhan China. The new name of this disease is coronavirus disease 2019, abbreviated as COVID-19. In COVID-19, ‘CO’ stands for ‘corona,’ ‘VI’ for ‘virus,’ and ‘D’ for disease. Formerly, this disease was referred to as “2019 novel coronavirus” or “2019-nCoV.”
There are many types of human coronaviruses including some that commonly cause mild upper-respiratory tract illnesses. COVID-19 is a new disease, caused be a novel (or new) coronavirus that has not previously been seen in humans. The name of this disease was selected following the World Health Organization (WHO) best practice external icon for naming of new human infectious diseases.
Q: What is the name of the virus causing the outbreak of coronavirus disease starting in 2019?
A: On February 11, 2020, the International Committee on Taxonomy of Viruses, charged with naming new viruses, named the novel coronavirus, first identified in Wuhan, China, severe acute respiratory syndrome coronavirus 2, shortened to SARS-CoV-2.
As the name indicates, the virus is related to the SARS-associated coronavirus (SARS-CoV) that caused an outbreak of severe acute respiratory syndrome (SARS) in 2002-2003, however it is not the same virus.
Q: What is the source of COVID-19?
A: Coronaviruses are a large family of viruses. Some cause illness in people, and others, such as canine and feline coronaviruses, only infect animals. Rarely, animal coronaviruses that infect animals have emerged to infect people and can spread between people. This is suspected to have occurred for the virus that causes COVID-19. Middle East Respiratory Syndrome (MERS) and Severe Acute Respiratory Syndrome (SARS) are two other examples of coronaviruses that originated from animals and then spread to people. More information about the source and spread of COVID-19 is available on the Situation Summary: Source and Spread of the Virus.
Q: How does the virus causing Coronavirus Disease-2019 (COVID-19), spread?
A: This virus was first detected in Wuhan City, Hubei Province, China. The first infections were linked to a live animal market, but the virus is now spreading from person-to-person. It’s important to note that person-to-person spread can happen on a continuum. Some viruses are highly contagious (like measles), while other viruses are less so. Currently, it’s unclear how easily or sustainably this virus is spreading between people. Learn what is known about the spread of newly emerged coronaviruses.
Q: Can someone who has had COVID-19 spread the illness to others?
A: The virus that causes COVID-19 is spreading from person-to-person. Someone who is actively sick with COVID-19 can spread the illness to others. That is why CDC recommends that these patients be isolated either in the hospital or at home (depending on how sick they are) until they are better and no longer pose a risk of infecting others.
How long someone is actively sick can vary so the decision on when to release someone from isolation is made on a case-by-case basis in consultation with doctors, infection prevention and control experts, and public health officials and involves considering specifics of each situation including disease severity, illness signs and symptoms, and results of laboratory testing for that patient.
Current CDC guidance for when it is OK to release someone from isolation is made on a case by case basis and includes meeting all of the following requirements:
- The patient is free from fever without the use of fever-reducing medications.
- The patient is no longer showing symptoms, including cough.
- The patient has tested negative on at least two consecutive respiratory specimens collected at least 24 hours apart.
Someone who has been released from isolation is not considered to pose a risk of infection to others.
Q: Can someone who has been quarantined for COVID-19 spread the illness to others?
A: Quarantine means separating a person or group of people who have been exposed to a contagious disease but have not developed illness (symptoms) from others who have not been exposed, in order to prevent the possible spread of that disease. Quarantine is usually established for the incubation period of the communicable disease, which is the span of time during which people have developed illness after exposure. For COVID-19, the period of quarantine is 14 days from the last date of exposure, because 14 days is the longest incubation period seen for similar coronaviruses. Someone who has been released from COVID-19 quarantine is not considered a risk for spreading the virus to others because they have not developed illness during the incubation period.
Q: Why might someone blame or avoid individuals and groups (create stigma) because of COVID-19?
A. People in the U.S. may be worried or anxious about friends and relatives who are living in or visiting areas where COVID-19 is spreading. Some people are worried about the disease. Fear and anxiety can lead to social stigma, for example, towards Chinese or other Asian Americans or people who were in quarantine.
Stigma is discrimination against an identifiable group of people, a place, or a nation. Stigma is associated with a lack of knowledge about how COVID-19 spreads, a need to blame someone, fears about disease and death, and gossip that spreads rumors and myths.
Stigma hurts everyone by creating more fear or anger towards ordinary people instead of the disease that is causing the problem.
Q: How can people help stop stigma related to COVID-19?
A: People can fight stigma and help, not hurt, others by providing social support. Counter stigma by learning and sharing facts. Communicating the facts that viruses do not target specific racial or ethnic groups and how COVID-19 actually spreads can help stop stigma.
Q: Is the coronavirus that causes COVID-19 the same as the MERS-CoV or the SARS-CoV virus?
A: No. Coronaviruses are a large family of viruses. Some coronaviruses cause cold-like illnesses in people. Others cause illness in certain types of animals, such as cattle, camels and bats. Rarely, animal coronaviruses can spread to people. This happened with SARS-CoV and MERS-CoV. The virus that causes COVID-19 likely also originated in an animal and spread to humans. The coronavirus most similar to the virus causing COVID-19 is SARS-CoV. There are ongoing investigations to learn more. The situation is changing, and information will be updated as it becomes available.
Q: How can I help protect myself?
A: Visit the COVID-19 Prevention and Treatment page to learn about how to protect yourself from respiratory illnesses, like COVID-19.
Q: What should I do if I had close contact with someone who has COVID-19?
A: There is information for people who have had close contact with a person confirmed to have, or being evaluated for, COVID-19 available online.
Q: Does CDC recommend the use of facemask in the community to prevent COVID-19?
A: CDC does not recommend that people who are well wear a facemask to protect themselves from respiratory illnesses, including COVID-19. You should only wear a mask if a healthcare professional recommends it. A facemask should be used by people who have COVID-19 and are showing symptoms. This is to protect others from the risk of getting infected. The use of facemasks also is crucial for health workers and other people who are taking care of someone infected with COVID-19 in close settings (at home or in a health care facility).
Q: What are the symptoms and complications that COVID-19 can cause?
Q: Should I be tested for COVID-19?
A: If you develop a fever1 and symptoms of respiratory illness, such as cough or shortness of breath, within 14 days after international travel, you should call ahead to a healthcare professional and mention your recent travel or close contact. If you have had close contact2 with someone showing these symptoms who has recently traveled from areas known to be affected by the virus, you should call ahead to a healthcare professional and mention your close contact and their recent travel. Your healthcare professional will work with your state’s public health department and CDC to determine if you need to be tested for COVID-19.
Q: How do you test a person for COVID-19?
A: At this time, diagnostic testing for COVID-19 can be conducted only at CDC.
State and local health departments who have identified a person under investigation (PUI) should immediately notify CDC’s Emergency Operations Center (EOC) to report the PUI and determine whether testing for COVID-19 at CDC is indicated. The EOC will assist local/state health departments to collect, store, and ship specimens appropriately to CDC, including during afterhours or on weekends/holidays.
For more information on specimen collection see CDC Information for Laboratories.
Q: Can a person test negative and later test positive for COVID-19?
A: Using the CDC-developed diagnostic test, a negative result means that the virus that causes COVID-19 was not found in the person’s sample. In the early stages of infection, it is possible the virus will not be detected.
For COVID-19, a negative test result for a sample collected while a person has symptoms likely means that the COVID-19 virus is not causing their current illness.
Q: What should healthcare professionals and health departments do?
A: For recommendations and guidance on persons under investigation; infection control, including personal protective equipment guidance; home care and isolation; and case investigation, see Information for Healthcare Professionals. For information on specimen collection and shipment, see Information for Laboratories. For information for public health professional on COVID-19, see Information for Public Health Professionals.
Public Health Response and Current Situation
Q: What is CDC doing about COVID-19?
A: This is an emerging, rapidly evolving situation and CDC will continue to provide updated information as it becomes available. CDC works 24/7 to protect people’s health. More information about CDC’s response to COVID-19 is available online.
Q: Am I at risk for COVID-19 in the United States?
A: This is a rapidly evolving situation and the risk assessment may change daily. The latest updates are available on CDC’s Coronavirus Disease 2019 (COVID-19) website.
Q: Has anyone in the United States gotten infected?
A: Yes. The first COVID-19 case in the United States was reported on January 21, 2020. The first confirmed instance of person-person-spread with this virus in the U.S. was reported on January 30, 2020. See the current U.S. case count of COVID-19.
Q: Am I at risk for COVID-19 from a package or products shipping from China?
A: There is still a lot that is unknown about the newly emerged COVID-19 and how it spreads. Two other coronaviruses have emerged previously to cause severe illness in people (MERS-CoV and SARS-CoV). The virus that causes COVID-19 is more genetically related to SARS-CoV than MERS-CoV, but both are betacoronaviruses with their origins in bats. While we don’t know for sure that this virus will behave the same way as SARS-CoV and MERS-CoV, we can use the information gained from both of these earlier coronaviruses to guide us. In general, because of poor survivability of these coronaviruses on surfaces, there is likely very low risk of spread from products or packaging that are shipped over a period of days or weeks at ambient temperatures. Coronaviruses are generally thought to be spread most often by respiratory droplets. Currently there is no evidence to support transmission of COVID-19 associated with imported goods and there have not been any cases of COVID-19 in the United States associated with imported goods. Information will be provided on the Coronavirus Disease 2019 (COVID-19) website as it becomes available.
Q: Will warm weather stop the outbreak of COVID-19?
A: It is not yet known whether weather and temperature impact the spread of COVID-19. Some other viruses, like the common cold and flu, spread more during cold weather months but that does not mean it is impossible to become sick with these viruses during other months. At this time, it is not known whether the spread of COVID-19 will decrease when weather becomes warmer. There is much more to learn about the transmissibility, severity, and other features associated with COVID-19 and investigations are ongoing.
COVID-19 and Animals
Q: What risks do animals or animal products imported from China pose?
A: CDC does not have any evidence to suggest that animals or animal products imported from China pose a risk for spreading COVID-19 in the United States. This is a rapidly evolving situation and information will be updated as it becomes available. The U.S. Centers for Disease Control and Prevention (CDC), the U. S. Department of Agriculture (USDA), and the U.S. Fish and Wildlife Service (FWS) play distinct but complementary roles in regulating the importation of live animals and animal products into the United States. CDC regulates animals and animal products that pose a threat to human health, USDA Department of Agriculture animals and animal products that pose a threat to agriculture; and Fish and Wildlife Service importation of endangered species and wildlife that can harm the health and welfare of humans, the interests of agriculture, horticulture, or forestry, and the welfare and survival of wildlife resources.
Q: Can I travel to the United States with pets during the COVID-19 outbreak?
A: Please refer to CDC’s requirements for bringing a dog to the United States. The current requirements for rabies vaccination apply to dogs imported from China, a high-risk country for rabies.
Q: Should I be concerned about pets or other animals and COVID-19?
A: While this virus seems to have emerged from an animal source, it is now spreading from person-to-person. There is no reason to think that any animals including pets in the United States might be a source of infection with this new coronavirus. To date, CDC has not received any reports of pets or other animals becoming sick with COVID-19. At this time, there is no evidence that companion animals including pets can be infected with or spread COVID-19. However, since animals can spread other diseases to people, it’s always a good idea to wash your hands after being around animals. For more information on the many benefits of pet ownership, as well as staying safe and healthy around animals including pets, livestock, and wildlife, visit CDC’s Healthy Pets, Healthy People website.
Q: Should I avoid contact with pets or other animals if I am sick with COVID-19?
A: You should restrict contact with pets and other animals while you are sick with COVID-19, just like you would around other people. Although there have not been reports of pets or other animals becoming sick with COVID-19, it is still recommended that people sick with COVID-19 limit contact with animals until more information is known about the virus. When possible, have another member of your household care for your animals while you are sick. If you are sick with COVID-19, avoid contact with your pet, including petting, snuggling, being kissed or licked, and sharing food. If you must care for your pet or be around animals while you are sick, wash your hands before and after you interact with pets and wear a facemask.
Q: What precautions should be taken for animals that have recently been imported (for example, by shelters, rescue groups, or as personal pets) from China?
A: Animals imported from China will need to meet CDC and USDA requirements for entering the United States. At this time, there is no evidence that companion animals including pets can be infected with or spread COVID-19. As with any animal introduced to a new environment, animals recently imported from China should be observed daily for signs of illness. If an animal becomes ill, the animal should be examined by a veterinarian. Call your local veterinary clinic before bringing the animal into the clinic and let them know that the animal was recently in China.
Q: Should I avoid animals and animal markets while I am travelling?
A: In the United States, there is no reason to think that any animals, including pets or livestock, might be a source of COVID-19 infection at this time. If you are visiting a live animal market anywhere in the world, it is important to clean your hands thoroughly with soap and water before and after visiting the market. Avoid contact with sick animals or spoiled products, as well as contaminated fluids and waste. Additional recommendations on basic protective measures are provided by WHO..
Everyone can do their part to help us respond to this emerging public health threat:
- Individuals and communities should familiarize themselves with recommendations to protect themselves from getting and spreading respiratory illnesses like COVID-19.
- Older people and people with severe chronic conditions should take special precautions because they are at higher risk of developing serious COVID-19 illness.
- If you are a healthcare provider, be on the look-out for people who have recently traveled from China or other affected area and who have symptoms associated with COVID-19, and people who have been in close contact with someone with COVID-19 or patients with pneumonia of unknown case.
- If you are a healthcare provider or public health responder caring for a COVID-19 patient, please take care of yourself and follow recommended infection control procedures.
- If you a close contact of someone with COVID-19 and develop symptoms of COVID-19, call your healthcare provider and tell them about your symptoms and your exposure.
- For people who are ill with COVID-19 but are not sick enough to be hospitalized, please follow CDC guidelines on how to reduce the risk of spreading your illness to others. People who are mildly ill with COVID-19 are able to isolate at home during their illness.
- If you have been to China or another affected area or have been exposed to someone sick with COVID-19 in the last 14 days, you will face some limitations on your movement and activity. Your cooperation is integral to the ongoing public health response to slow the spread of the virus.