Human Coronavirus

Human coronaviruses are common throughout the world. Six different coronaviruses, that scientists know of, can infect people and make them sick. Some human coronaviruses were identified many years ago and some have been identified recently. Human coronaviruses commonly cause mild to moderate illness in people worldwide. Two newer human coronaviruses, MERS-CoV and SARS-CoV, have been known to frequently cause severe illness.

About Coronaviruses

Information about the viruses, how they spread, symptoms, diagnosis, treatment, prevention...

Human Coronavirus Types

Information about the six types of coronaviruses including MERS-CoV and SARS-CoV...

Resources and References

Links to related web pages and scientific publications ...

MERS Coronavirus

Middle East Respiratory Syndrome Coronavirus (MERS-CoV) was first reported in 2012 in Saudi Arabia and has since caused illness in people in more than 25 other countries, including the United States. Most people reported to have MERS-CoV infection developed severe acute respiratory illness, including fever, cough, and shortness of breath.

Only two patients in the U.S. have ever tested positive for MERS-CoV infection—both in May 2014. CDC continues to closely monitor the situation. More about MERS in the U.S.

Where Do Coronaviruses Come From?
Fruit bat

Coronaviruses are common in many different species of animals, including camels and bats. Rarely, these coronaviruses can evolve and infect humans and then spread between humans. Recent examples of this include SARS-CoV and MERS-CoV.

Most coronaviruses infect animals, but not people. In the future, one or more of these other coronaviruses could potentially evolve and spread to humans, as has happened in the past. We still don’t understand why only certain coronaviruses are able to infect people.