कोरोना वेरिएंट्स के खिलाफ कितनी कारगर Pfizer वैक्सीन? ये रहे नतीजे

Pfizer COVID-19 Vacccine: People fully vaccinated with two doses of the Pfizer-BioNTech vaccine are likely to have more than five times lower levels of neutralising antibodies against the Delta variant (B.1.617.2) when compared to the original strain