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Show New Bang's Vaccine Proves Successful A new kind of vaccine appears to be "99 per cent effective" in checking losses caused by brucclo-sis, brucclo-sis, one of today's most serious disease of cattle. This conclusion, drawn from a large-scale experiment involving the vaccination of hundreds of Michigan cows, was reported at the national convention of the American Veterinary Medical Association As-sociation held recently. The report was submitted by Dr. I. Forest Huddleson, research of bacteriology and public health at Michigan State' College, East Lansing. In the first stage of the experiments, experi-ments, "Brucella M" vaccine was administered to 772 "clean cows" in 22 private herds containing more than 100 infected animals from which the disease might be contracted. Only 23 vaccinated cows became infected in the ensuing en-suing 12 to 14 months. Then, to further check the value of "Brucella M," smaller numbers of clean cows in four herds were vaccinated and other clean cows in the same herds were left unvac-cinated unvac-cinated to serve as "controls." Tests a year later showed only one vaccinated animal was infected, while many of the unprotected "controls" had contracted the disease. |