Coronavirus: About COVID-19

About COVID-19

Coronaviruses are a family of viruses that can cause respiratory illness in people. Coronaviruses circulate among animals, including camels, cattle, cats, and bats. Just like there are different types of related viruses that cause smallpox, chickenpox, and monkeypox, different coronaviruses cause different diseases in people. The Severe Acute Respiratory Syndrome (SARS) coronavirus causes SARS and the Middle East Respiratory Syndrome (MERS) coronavirus causes MERS. The novel coronavirus, COVID-19 is one of seven types of known human coronaviruses. COVID-19, like the MERS and SARS coronaviruses, likely evolved from a virus previously found in animals. The remaining known coronaviruses cause a significant percentage of colds in adults and children, and these are not a serious threat for otherwise healthy adults. More...

Situation Summary

CDC is responding to an outbreak of respiratory disease caused by a novel (new) coronavirus that was first detected in China and which has now been detected in almost 70 locations internationally, including in the United States. The virus has been named “SARS-CoV-2” and the disease it causes has been named “coronavirus disease 2019” (abbreviated “COVID-19”).

On January 30, 2020, the International Health Regulations Emergency Committee of the World Health Organization declared the outbreak a “public health emergency of international concernexternal icon” (PHEIC). On January 31, 2020, Health and Human Services Secretary Alex M. Azar II declared a public health emergency (PHE) for the United States to aid the nation’s healthcare community in responding to COVID-19.

How it Spreads

The virus is thought to spread mainly from person-to-person, between people who are in close contact with one another (within about 6 feet). It is spread through respiratory droplets produced when an infected person coughs or sneezes. These droplets can land in the mouths or noses of people who are nearby or possibly be inhaled into the lungs.

Can someone spread the virus without being sick? People are thought to be most contagious when they are most symptomatic (the sickest). Some spread might be possible before people show symptoms; there have been reports of this occurring with this new coronavirus, but this is not thought to be the main way the virus spreads.

Symptoms

Reported illnesses have ranged from mild symptoms to severe illness and death for confirmed coronavirus disease 2019 (COVID-19) cases.

The following symptoms may appear 2-14 days after exposure.*

• Fever
• Cough
• Shortness of breath

Call your doctor if you develop symptoms, and have been in close contact with a person known to have COVID-19 OR have recently traveled from an area with widespread or ongoing community spread of COVID-19. International areas with sustained transmission include China, Iran, Italy, Japan and South Korea.

Prevention

There is currently no vaccine to prevent COVID-19. The best way to prevent illness is to avoid being exposed to this virus. However, as a reminder, CDC always recommends everyday preventive actions to help prevent the spread of respiratory diseases, including:

• Avoid close contact with people who are sick.
• Avoid touching your eyes, nose, and mouth.
• 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.
• Wash your hands often with soap and water for at least 20 seconds, especially after going to the bathroom; before eating; and after blowing your nose, coughing, or sneezing. If soap and water are not readily available, use an alcohol-based hand sanitizer with at least 60% alcohol. 

Treatment

There is no specific antiviral treatment recommended for COVID-19. 

People with COVID-19 should receive supportive care to help relieve symptoms. For severe cases, treatment should include care to support vital organ functions. People who think they may have been exposed to COVID-19 should contact their healthcare provider immediately.

Testing

CDC has developed a new laboratory test kit for use in testing patient specimens for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the virus that causes COVID-19. The test kit is called the “Centers for Disease Control and Prevention (CDC) 2019-Novel Coronavirus (2019-nCoV) Real-Time Reverse Transcriptase (RT)-PCR Diagnostic Panel.” It is intended for use with the Applied Biosystems 7500 Fast DX Real-Time PCR Instrument with SDS 1.4 software. This test is intended for use with upper and lower respiratory specimens collected from persons who meet CDC criteria for COVID-19 testing. CDC’s test kit is intended for use by laboratories designated by CDC as qualified, and in the United States, certified under the Clinical Laboratory Improvement Amendments (CLIA) to perform high complexity tests. The test kits also will be shipped to qualified international laboratories, such as World Health Organization (WHO) Global Influenza Surveillance Response System (GISRS) laboratories. 

Recovery and Survival Rate

Unfortunately, there's not enough information that's readily available yet to determine the true survival rate of COVID-19. As for the data we do have, that information shows a low fatality rate and high survival rate. In a new viewpoint article published February 24 in the Journal of the American Medical Association (JAMA), authors looked at the case records of 72,314 patients, 44,672 of which were confirmed as having COVID-19. Of those confirmed cases, 36,160 cases, or 81%, showed only mild symptoms, while 14% were severe and 5% critical. The overall case-fatality rate, or coronavirus cases that ended in death, was only 2.3%, or 1,023 deaths out of 44, 672 confirmed cases.

Travel Concerns

CDC provides recommendations on postponing or canceling travel. These are called travel notices and are based on assessment of the potential health risks involved with traveling to a certain area. A list of destinations with travel notices is available at https://www.cdc.gov/coronavirus/2019-ncov/travelers/index.html.

Warning Level 3: CDC recommends travelers avoid all nonessential travel to destinations with level 3 travel notices because of the risk of getting COVID-19.

Alert Level 2: Because COVID-19 can be more serious in older adults and those with chronic medical conditions, people in these groups should talk to a healthcare provider and consider postponing travel to destinations with level 2 travel notices.

Watch Level 1: CDC does not recommend canceling or postponing travel to destinations with level 1 travel notices because the risk of COVID-19 is thought to be low.