Discover and read the best of Twitter Threads about #challengestudies

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Some points of consideration #COVIDー19 #vaccine development:

Which populations should be studied first?

Which endpoints will be clinically meaningful (or not) for clinical trials

Viral Load Testing: e.g., its utility in upper vs lower resp tract

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@ArthurCaplan is sceptical about a #COVID19 vaccine in the next 12 months, due to many challenges such as:
- vaccine efficacy
- distribution issues (WHO vs US; where the initial batches of vaccine go. could set off international disputes)
- many vaccines require > 1 shot

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If you are waiting for ppl to get naturally infected by #COVID19 & the virus ebbs and flows, you will wait for a long time.

@ArthurCaplan discussed *human challenge studies* (ethically controversial, too) as an alternative to standard #COVID19 vaccine studies.

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