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.@NEJM just published a letter on a cluster in Germany that appears to have originated with transmission of #coronavirus before a patient became symptomatic. If asymptomatic transmission of #nCoV is common, major implications for control strategies. 
NOTE: most diagnosed outside of China have had mild illness. This suggests there may be many mild and unrecognized infections in China. We understand more each hour and need to keep learning so we can best protect people.
If #nCoV spreads commonly from presymptomatic or asymptomatic people, it likely has and will continue to spread widely, but may not commonly cause severe illness. #PreventEpidemics bit.ly/2RIpWSO
