Primarily it comes from the fact that we process and store food. Scavengers are built to be able to handle the microbes that grow on spoiled meat, and everything else eats their food fresh as it gets.
Storage of non-living foods opens up the chance for harmful microbes to colonize it. Our assembly line-style farms and slaughterhouses for animals also allow harmful microbes like salmonella to be easily spread to all the cuts of meat as opposed to the occasional animal.
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