The earliest form of smallpox immunization was used in China in the 1500’s. Doctors would take ground up scabs from people with mild cases of the disease, and blow the material into their nostrils. This lead to a mild version of the disease which had a mortality rate of ~2%. (20-30%if untreated)
Ants use “social immunization” – if one is infected with a fungus, they still….
Ants use “social immunization” – if one is infected with a fungus, they still lick the ant, spreading it throughout the colony. This practice both kills some of the spores, and builds immune resistance.