The disease effect would not be immediate enough to make the connection.
The disease effect is too hit or miss to look related to pork because lots of people who eat pork wouldn't have any symptoms.
It doesn't take a genius to notice that Tribe A, who raises and eats pigs, gets sick in a specific way a lot more than Tribe B, who raises and eats sheep. It only takes people noticing it once to be passed down.
Not saying that happened, but it's not exactly far beyond belief that it could have happened.
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