The first case of Wuhan virus has reportedly been detected in the U.S.

The Wuhan virus, which broke out in China last month and has so far infected more than 300 people and killed six, has reportedly reached U.S. shores, a federal source told CNN.

The Centers for Disease Control and Prevention is expected to announce Tuesday that a person in Washington state has been infected, making the U.S. the sixth country to experience the outbreak of the respiratory illness, along with China, Taiwan, Japan, Thailand, and South Korea. The patient was hospitalized with pneumonia last week after having traveled to eponymous Wuhan, China, where the outbreak appears to have originated at a seafood and poultry market, The New York Times reports.

A lot remains unknown about the virus, although the latest development strengthens the hunch that it spreads from person to person. One of the most pressing questions, Dr. William Schaffner, a professor of preventative medicine and infectious diseases at Vanderbilt University Medical Center, told the Times, is how frequent that human-to-human transmission is. Read more at The New York Times and CNN.

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