The combination of Delta and Omicron variants is driving a dangerous tsunami of Covid-19 cases, the World Health Organization (WHO) chief has said. Tedros Adhanom Ghebreyesus' words came as the US ...

Faster post-COVID-19 recovery is observed after infection with the Omicron vs earlier variants, regardless of vaccination status.

As South Korea battled a spike in flu cases, misinformation swirled online that the country was suffering a resurgence of the ...

Alpha, Delta, and Omicron (panel B). Key symptoms such as fatigue, cardiopulmonary issues, and cognitive impairments vary in incidence, with reductions in severity observed in later variants like ...