Alice Catherine Evans service worker was protected by law. Alice became interested in the disease brucellosis and its relationship to fresh, unpasteurized milk. Alice's investigation focused on the organism "Bacillus abortus", known to cause miscarriages in animals. Alice learned that the microbe thrived in infected cows as well as animals that appeared healthy. The reports hypothesized that since the bacteria was found in cow's milk, a threat to human health was likely. Evans decided to investigate this; she wondered whether the disease in cows could be the cause of undulant fever in humans. She reported her findings to the Society of American Bacteriologists
Brucellosis a "calfhood" vaccination. Most cattle receive a tattoo in one of their ears, serving as proof of their vaccination status. This tattoo also includes the last digit of the year they were born. The first state–federal cooperative efforts towards eradication of brucellosis caused by "Brucella abortus" in the U.S. began in 1934. Brucellosis was originally imported to North America with non-native domestic cattle ("Bos taurus"), which transmitted the disease to wild bison ("Bison bison") and elk ("Cervus canadensis"). No records exist of brucellosis in ungulates native to America until the early 19th century. Antibiotics such as tetracyclines, rifampin, and the