How it Spreads

Coronaviruses are a large family of viruses that are common in many different species of animals, including camels, cattle, cats, and bats. Rarely, animal coronaviruses can infect people and then spread between people such as with MERS and SARS. Many of the patients in the pneumonia outbreak caused by 2019-nCov in Wuhan, China had some link to a large seafood and live animal market, suggesting animal-to-person spread. However, a growing number of patients reportedly have not had exposure to animal markets, indicating person-to-person spread is occurring.

When person-to-person spread has occurred with MERS and SARS, it is thought to have happened via respiratory droplets produced when an infected person coughs or sneezes, similar to how influenza and other respiratory pathogens spread. Spread of SARS and MERS between people has generally occurred between close contacts.

It’s important to note that how easily a virus spreads person-to-person can vary. Some viruses are highly contagious (like measles), while other viruses are less so. It’s not clear yet how easily 2019-nCoV spreads from person-to-person. It’s important to know this in order to better understand the risk associated with this virus.

There is much more to learn about the transmissibility, severity, and other features associated with 2019-nCoV and investigations are ongoing. The latest situation summary updates are available on CDC’s web page 2019 Novel Coronavirus, Wuhan, China.

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Transmission

Human coronaviruses most commonly spread from an infected person to others through

the air by coughing and sneezing
close personal contact, such as touching or shaking hands
touching an object or surface with the virus on it, then touching your mouth, nose, or eyes before washing your hands
rarely, fecal contamination

In the United States, people usually get infected with common human coronaviruses in the fall and winter. However, you can get infected at any time of the year. Most people will get infected with one or more of the common human coronaviruses in their lifetime. Young children are most likely to get infected. However, people can have multiple infections in their lifetime.