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What could possibility be the earliest time penicilin or other forms of antibiotics could be discovered? My premise is for a TL that averts the Dark Ages, and instead we get a Renaissance-style boost in arts and sciences in a Roman/Persian Golden Age (still working out who ends up dominant based on events of the TL). While I doubt extraction of the compound with the precision of today is possible, could more rudimentary forms of anti-biotics be discovered?
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