(REUTERS) Scientists in China studying the outbreak of disease caused by the new coronavirus say they have found that two main strains of the virus are circulating in humans and causing infections.
The researchers, from Peking University’s School of Life Sciences and the Institut Pasteur of Shanghai under the Chinese Academy of Sciences, cautioned that their study looked only at a limited range of data, and said follow-up studies of larger data sets were needed to better understand the virus’s evolution.
The preliminary study found that a more aggressive strain of the new coronavirus associated with the outbreak in Wuhan accounted for about 70% of analyzed cases, while 30% were linked to a less aggressive type.
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The prevalence of the more aggressive virus type decreased after early January 2020, they said.