Cryptic transmission of SARS-CoV-2 in Washington State et al. single introduction to WA...
This paper and others outline that #SARSCoV2 virus circulated cryyptically and was undetected 4-6 weeks before the first #COVID19 community transmission case was detected at Seattle. Mass testing will enable to chase these under detected community cases
Call it flu if you like. Very contagious flu. Flu that you can get from people who appear to have no symptoms. Cryptic flu.