Listeria tainted milk produced by Central Massachusetts’ Whittier Farms is the likely source of a listeriosis outbreak in that state, killing two elderly men and sickening two others. Whittier has halted production and alerted its customers. Listeriosis is a type of food poisoning especially dangerous to the elderly, pregnant women, newborns, and those with chronic medical conditions. Investigators have been unable to pinpoint the exact listeria contamination source in the production process; however, samples tested positive for listeria, said Dr. Alfred DeMaria, the state’s director of communicable disease control. DeMaria believes milk was tainted following pasteurization, perhaps when flavoring was added or during bottling. Milk is sold under the names Whittier, Schultz, Balance Rock, Spring Brook, and Maple.
According to the U.S. Centers for Disease Control and Prevention, about 2,500 people become seriously ill with listeriosis annually; 500 result in death. In Massachusetts, about 25 cases are identified yearly, but DeMaria said those represent only a fraction since most people experience only mild flu like symptoms—fever, muscle aches, nausea, or diarrhea—never reporting them. In serious cases, the disease spreads to the nervous system, causing headaches, stiff neck, and convulsions. Listeria lives in soil and water and can easily contaminate dairy and beef products; because listeria thrives in cold, milk is an ideal environment.
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