Study Using Mice with ‘Humanized Immune Systems’ Help Suggest why COVID-19 Makes some Sicker than Others December 27, 2021
More kids hospitalized with Covid, but experts aren’t sure if they’re sicker, too September 16, 2021September 16, 2021
Severe Covid-19 breakthrough cases tend to be in older and sicker people, Yale study finds September 9, 2021September 9, 2021
Israeli doctors find severe COVID-19 breakthrough cases mostly in older, sicker patients August 20, 2021August 20, 2021