Intrinsic and effective severity of COVID-19 cases infected with the ancestral strain and Omicron BA.2 variant in Hong Kong https://www.medrxiv.org/content/10.1101/2023.02.13.23285848
Intrinsic and effective severity of COVID-19 cases infected with the ancestral strain and Omicron BA.2 variant in Hong Kong https://www.medrxiv.org/content/10.1101/2023.02.13.23285848