Skip Navigation LinksnCOV2019

immunization branch

Novel Coronavirus 2019 (nCoV-2019)

Situation Summary:

On January 11, 2020, Chinese health authorities preliminarily identified more than 40 human infections with a novel coronavirus in an outbreak of pneumonia under investigation in Wuhan City, Hubei Province, China. Chinese health authorities subsequently posted the full genome of the so-called "novel coronavirus 2019" or "nCoV-2019" in GenBank ®, the NIH genetic sequence database. Subsequently, on January 13, Thailand confirmed detection of a human infection with nCoV-2019 in a traveler from Wuhan City to Thailand.

Coronaviruses are a large family of viruses, some causing illness in people and others that circulate among animals, including camels, cats and bats. Rarely, animal coronaviruses can evolve and infect people and then spread between people such as has been seen with MERS and SARS. The outbreak in Wuhan, China has been reported to be linked to a large seafood and animal market, suggesting a possible zoonotic origin to the outbreak.

There is an ongoing investigation to determine more about this outbreak. This is a rapidly evolving situation and information will be updated as it becomes available.

The World Health Organization (WHO) provided updated guidance specific to this response the evening of January 10, 2020. Clinicians should use WHO guidance until CDC guidance is updated in the coming days.

Page Last Updated :