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McAfee’s milk is highly regulated by the state of California, which performs frequent testing for food-illness pests such as campylobacter, cryptosporidium, E. coli, listeria, brucella and salmonella and other bacterial illnesses in his milk.

Per the organization, these illnesses are attributed to a variety of pathogens, including: Escherichia coli, Campylobacter jejuni, Salmonella, Listeria monocytogenes, and Brucella abortus.

If cattle were to become infected with the highly contagious Brucella abortus bacterium, it would result in a lockdown of the animals.

Because the test was measuring the immune system’s response to the infection, rather than finding the bug itself, he knew it was possible that the positive result could be triggered by a bacterium other than Brucella.

Her immune-system testing indicated that she had been infected with a bug called Brucella.