April 20 1918: Municipal Journal article. Tracing of Typhoid Carrier Halts Epidemic. “Superior, Wis.-What threatened to be a serious epidemic of typhoid fever in this city has just been successfully averted. Nine cases of the malady broke out on one milk route, but it was successfully checked by Dr. D. R. Searle, city health commissioner; William Strasser, city bacteriologist, and Emil Haeske, milk inspector. This fight against typhoid is one of the most interesting in the city’s history. Two previous outbreaks of the disease had occurred on the same milk route, but the cause of the trouble has been removed at last. A dairyman’s wife and son have been discovered to have carried the disease for 16 years. Health commissioner Searle gave it as his opinion that if the epidemic had not been stopped when it was, it might easily have affected hundreds of persons. When a cousin of one of the dairy farmers who supplies Superior’s retail milk demand came over from Duluth sixteen years ago to recuperate from an illness with typhoid fever, this was the first link in the chain of infection, according to the authorities. Next the dairyman’s wife became ill with the disease, also one of his sons. Both recovered completely.
However, health department officials have found that the woman had been a carrier of typhoid for sixteen years and both herself and her son have been carriers of para-typhoid for that length of time. One case broke out on the milk route more than a month ago, but it was not reported immediately by the physician in charge. Then two more cases broke out and the health department began to investigate. The milk supply was immediately subjected to pasteurization. Blood and other tests were made on all members of the family and the premises were cleaned up on the dairy farm. Those who were found to be carriers of the disease were isolated.
Reference: “Tracing of Typhoid Carrier Halts Epidemic.” Municipal Journal article 44:16(April 20, 1918): 334.
Commentary: Even though this is a story about a typhoid epidemic that was spread by milk instead of water, it recounts the difficult time that health authorities had with identifying typhoid fever carriers—people who carried the bacterium in their gut but they did not have symptoms of the disease. Typhoid Mary was the most famous typhoid carrier in U.S. history.