Older age, lack of vaccination and infection with variants other than Omicron associated with severity of COVID-19 and in-hospital mortality in Pakistan https://www.medrxiv.org/content/10.1101/2023.01.30.23285170
Older age, lack of vaccination and infection with variants other than Omicron associated with severity of COVID-19 and in-hospital mortality in Pakistan https://www.medrxiv.org/content/10.1101/2023.01.30.23285170