There is a large argument that cowpox does not work because it is a disease from a different species and not related to human smallpox. The idea of vaccination was born on the back of old wives tales and superstition. At that time no one knew about our immune system, in fact science still doesn't know a whole lot about the immune systems. They just discovered gut bacteria are part of our immune system and vaccines are found to destroy gut bacteria...I wrote about this in my previous article thank you @hassanben
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you welcome madam @reddust