Which Covid-19 vaccine is more effective against the variant found in India?
Although it is still too early to know, there is some evidence suggesting that the Delta variant reduces vaccine efficacy. Data from cases in England showed that the effectiveness of both the Pfizer and AstraZeneca vaccines had been lowered after one dose from 51.1% to 33.5%. But after a second shot, the decline in efficacy was smaller. In those who received the AstraZeneca jab, the efficacy had gone down from 66.1% to 59.8% and those who got the Pfizer vaccine saw a drop from 93.4% to 87.9%.