COVID-19 Vaccine Should Demonstrate At Least 50% Effectiveness, US FDA Says
Guidance on COVID-19 vaccine development and licensure appears to set a precedent in specifying the clinical efficacy rate for a product approval; agency also takes accelerated approval off the table for now and says emergency use authorization may be granted only after safety and efficacy have been demonstrated.
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India has rolled out draft guidelines for development of vaccines with special focus on COVID-19 vaccines, drawing from those of other regulatory bodies and the WHO. Experts suggest the primary efficacy endpoint of minimum 50% is acceptable given that vaccines against respiratory diseases are difficult to develop though not necessarily enough to snuff out a pandemic.
Trial diversity is among the issues that stakeholders worry could hinder vaccine uptake.
Neither has announced a firm timeline, and the difference between Pfizer's 'October' and Moderna's 'November' could be mere hours or a few weeks, but Pfizer, by dint of luck or experience, is now in a position to offer the more optimistic projection on when it will seek an EUA. Both firms release their Phase III trial protocols, which seem in line with US FDA guidance.