Women and younger patients had the highest survival rates in this study — but one group’s fatality rate was 14.8%.
The medical journal JAMA released a paper this week analyzing data from the Chinese Center for Disease Control and Prevention on 72,314 coronavirus cases in mainland China, the figure as of Feb. 11, the largest such sample in a study of this kind.
The fatality rate was 49% among critical cases and worsened among those with preexisting conditions. The latest China-based study, which was not peer-reviewed by U.S. scientists, found that men had a fatality rate of 2.8% versus 1.7% for women. Some doctors have said that women may have a stronger immune system as a genetic advantage to help babies during pregnancy.
A man in California tested positive, bringing the total number of confirmed cases in the U.S. to 60. He had not traveled to an affected country or likely been in contact with another confirmed case, raising the possibility of a so-called community infection with no known source. “COVID-19 rapidly spread from a single city to the entire country in just 30 days,” the JAMA paper added. “The sheer speed of both the geographical expansion and the sudden increase in numbers of cases surprised and quickly overwhelmed health and public-health services in China.”
Coronavirus has an incubation period of up to two weeks, helping the virus to spread. A previous study published in JAMA suggests some patients may be more contagious than others. One patient spread the virus to at least 10 health-care workers and four patients at a hospital in Wuhan. Maciej Boni, an associate professor of biology, at Pennsylvania State University, wrote in the online science magazine LiveScience that the 2009 H1N1 flu pandemic initially overestimated the final fatality rate, while the SARS fatality rate rose as the virus spread.
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