After the death of dozens of crows in Solapur, authorities are on high alert after it was confirmed to be caused by bird flu.

Early flu exposure helps immunity against H5N1 infection, with older adults having stronger antibody responses.

SARS-CoV-2 has been evolving the ability to evade the immune system about twice as fast as the fastest-evolving flu virus. It averages more than a dozen significant changes every year.

Vaccine hesitancy was rising even before COVID-19 emerged – but the pandemic exacerbated the trend. More kindergartners are ...