" ….In time, the Europeans brought in pigs and horses, both of which were allowed to run wild and multiply. Pigs in the wild soon became aggressive feral boars with tusks, eating everything in sight. Corn, which the Indians depended upon, was attacked and uprooted by the pigs before maturing, thus leaving the Indians without an important source of nourishment. Although pigs provided a necessary source of protein, they were also known to host worms and parasites, and spread viruses such as influenza. If undercooked, the meat could cause trichinosis infections that, depending upon the severity, could result in death in four to six weeks.
The sailors returning to Europe brought with them tobacco and syphilis, both of which could be fatal. Syphilis is the gift that keeps on giving and soon spread throughout Europe and England. Unknown prior to the discovery of America, it became another blight on the European continent.
Because of their close connection, many people were convinced that pigs were the carriers of Syphilis. Perhaps they were right….
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― Hank Bracker , Suppressed I Rise