Its kinda conspiracy theory stuff but there are claims around this: https://rationalwiki.org/wiki/Ethnic_bioweapon#Claimed_bioweapons https://rationalwiki.org/

Its kinda conspiracy theory stuff but there are claims around this: https://rationalwiki.org/wiki/Ethnic_bioweapon#Claimed_bioweapons https://rationalwiki.org/wiki/Ethnic_bioweapon#Claimed_biowe... I would be very surprised if some countries had not looked into this at some level.