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Covid decline may slow vaccine efficacy testing Premium 3 min read Share Via Read Full Story A sharp drop in the number of covid-19 cases may handicap vaccine developers that are likely to start testing the effectiveness of their shots and potentially delay their approvals in India, where the first phase of the world’s largest immunization programme is set to start next week. Testing the effectiveness of vaccines, which is established in phase 3 of clinical trials, requires volunteers who hav...

Serum antidote may be rolled out by mid-January; confusion as Bharat Bio yet to submit efficacy data