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Wuhan coronavirus (2019-nCoV)
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Middle East respiratory syndrome (MERS)
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Severe acute respiratory syndrome (SARS)
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Common cold caused by coronavirus
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| Origin | First reported in December 2019 in Wuhan, China. | First reported in 2012 in Saudi Arabia. | First reported in 2002 in southern China. | Four coronavirus strains are thought to be responsible for 15-30% of common colds. |
| Transmission | Likely from touching or eating an infected, as yet unidentified animal. Human-to-human transmission occurs through close contact. | Often from touching infected camels or consuming their milk or meat. Limited transmission between humans through close contact. | Believed to have spread from bats, which infected civets.Transmitted mainly between humans through close contact. | Close contact with infected humans or touching a surface that carries the virus. |
| Cases | Around 500 confirmed; 17 deaths as of Jan. 22. Some victims were older males with preexisting conditions. | 2,494 confirmed cases; 858 deaths (as of Nov. 30, 2019). Mortality rate of 34%. | 8,098 cases; 774 deaths. Mortality rate of about 10%. | Millions each year. Generally nonlethal with rare exceptions. |
| Current status | Cases reported mainly in Wuhan, as well as other parts of China and Asia. One case reported in U.S. | All cases linked to Arabian Peninsula, with 80% in Saudi Arabia. Others in about two dozen countries, including U.S. Cases and deaths have been declining since 2016. | No new cases reported since 2004. 87% of previous cases in China and Hong Kong. | Circulates year-round, but more common in fall/winter. |
Cases as of Jan. 22.