What is the number of people needed for validity of drug prophylactic for covid19 ?

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Pranav Ish

The number needed to prevent is to be calculated. However, it needs to be interpreted with cost-benefit analysis, the severity of illness, and its infectivity.

Dr. Ijaz sir has already shared articles to get an idea.

https://www.researchgate.net/deref/https%3A%2F%2Fwww.thelancet.com%2Fjournals%2Flaninf%2Farticle%2FPIIS1473-30992030313-3%2Ffulltext

Ette Etuk

With as little as a size of 30, a sample is big enough for the application of the central limit theorem in which case all means can assume normal distributions. With as few as 30 persons you can test for the efficacy of a drug confidently.