What did Jenner inject to people to make them resist small pox (or was it cow pox) ?

Was it pus? Hehe. Its for my research study. I'll invent a new vaccine for a disease caused by an insect. There are certain types of this particular insect that once you get bitten, you'll never have to have the same type of diease it carries. Hope you'll be of help. Thanks! ^_^

Answer:
He injected them with fluid containing cow pox (vaccinia) to protect them from small pox (variola). Vaccinia produces a benign infection, and once the immune system has fought it off it can also fight off the related but much nastier variola virus (cross immunity).

Good luck with your project. First you'll have to find a pair of viruses that share cross immunity and which are both spread by insects, with one virus nasty and one benign.

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