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Mint reported. A phase 2 trial is used to test the immune response provided by the vaccine against a disease in a person. This differs from a phase 3 trial, which tests for efficacy, or what proportion of people are protected by the vaccine, said the paper. The trial will be used to test the immune response provided by the vaccine against a disease in a person. Bharat Biotech s vaccine had shown 81 per cent efficacy in preventing symptomatic Covid-19 in an interim analysis of a late-stage trial in India. In its phase 2 trial, which the firm started in August, it divided 380 participants into two groups, where one was given two doses of 3 mcg and another 6 mcg. In both groups, the two doses were given one month apart, Mint reported. Hiwever, it is not clear now why Bharat Biotech has modified the trial to test for a third dose six months after the second dose.

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