COVID-19: Which vaccines are effective against the delta variant?

The Pfizer vaccine was 94% effective at preventing hospitalization after the first dose and 96% after two doses.In India, the Oxford-AstraZeneca COVID-19 vaccine bears the name Covishield.The report, which has not been peer-reviewed yet, puts these percentages on a par with protection against the alpha variant, or B.1.1.7, which scientists first identified in the U.K.“These findings indicate very high levels of protection against hospitalization with the delta variant with one or two doses of either vaccine,” the authors write.It comes after an earlier report that indicates COVID-19 vaccines were less effective at protecting people from COVID-19 if they had only received the first dose of the Pfizer-BioNTech or Oxford-AstraZeneca vaccines.However, in the analysis, which has not yet undergone peer review, the researchers measured any symptomatic case of COVID-19, regardless of severity.There is next to no data on how other COVID-19 vaccines are faring against the delta variant at this stage.A small research study, not yet peer-reviewed, from scientists at the Indian Council of Medical Research and Bharat Biotech International, who co-developed the Covaxin COVID-19 vaccine, reports on its effectiveness against the delta variant.The researchers found that antibodies from vaccinated individuals were not as effective at neutralizing the virus variant in a lab study.