Coronavirus vaccines made by pharmaceutical companies AstraZeneca and Pfizer are effective against Delta and Kappa variants, first discovered in India, reported Reuters, citing a study. The study conducted by Oxford University was looking into the ability of monoclonal antibodies in the blood of recovered patients and those who have been vaccinated to neutralise the two variants. The analysis by the United Kingdom body conducted last week showed that the Pfizer and AstraZeneca vaccines were highly effective in preventing hospitalisation in cases of the Delta variant. While two doses of AstraZeneca jab offered 92% protection against hospitalisation, the Pfizer shot is 96% effective.