immunity

Scientists who helped develop Pfizer-BioNTech Covid vaccine agree the third shot is needed as immunity declines

Is herd immunity against COVID-19 possible? Experts are increasingly saying no.

Pfizer claims that there will be a third dose of vaccine against COVID-19

GET herd immunity ‘illusion’. Is he right?

Israel has not achieved herd immunity, an Indian variant is a concern, says virus tsar

China considers mixing COVID-19 vaccines to boost immunity

SARS-CoV-2 variant found in Brazil: Contagious, may limit immunity

Very far from herd immunity and the need for booster shoots

Has India detected a new dangerous COVID-19 strain that could ‘escape’ immunity?

Bukele mantiene blindaje a Anliker al nombrarlo viceministro de Agricultura

Breakthrough cases of COVID vaccines could be key to unlocking immunity

Experts discuss whether it is possible to achieve Covid immunity