Intrinsic and effective severity of COVID-19 cases infected with the ancestral strain and Omicron BA.2 variant in Hong Kong.
Jessica Y WongJustin K CheungYun LinHelen S BondEric H Y LauDennis K M IpBenjamin John CowlingPeng WuPublished in: The Journal of infectious diseases (2023)
Omicron has comparable intrinsic severity to the ancestral Wuhan strain although the effective severity is substantially lower in Omicron cases due to vaccination.