(CNN) Nearly half a million residents in the Chinese city where the novel coronavirus first emerged may have been infected with Covid-19 -- almost 10 times its official number of confirmed cases, according to a study by the Chinese Center for Disease Control and Prevention (CDC). The researchers found an antibody prevalence rate of 4.43% for Covid-19 among residents in Wuhan, a metropolis of 11 million people. The Chinese CDC said the study was conducted a month after China "contained the first wave of the Covid-19 epidemic." The prevalence rate outside of Wuhan is significantly lower, the study showed. In other cities in Hubei, only 0.44% of residents surveyed were found to have coronavirus antibodies.

Source: CNN December 29, 2020 08:03 UTC