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They’ve also been known to carry several diseases dangerous to humans, including swine brucellosis, pseudorabies and leptospirosis.

In the 1980s, as a teenager, he watched as an outbreak of pseudorabies, another viral disease, forced his family to cull thousands of pigs, and he retains the chilling memory of earth-moving equipment removing the carcasses.

For wildlife and livestock, those diseases include pseudorabies, swine brucellosis, bovine tuberculosis and leptospirosis.

The Missouri Department of Agriculture says officials focused on the Callaway County herd after feral hogs in the area tested positive for pseudorabies.

Park researchers already have used GPS to map the locations of the hogs that have been trapped and killed, as well as the locations of the pigs that tested positive for pseudorabies.