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Some 216 cows with chronic mastitis (majority S. agalactiae infection) were injected i/m with 10 million i.u. benzylpenicillin 2-diethylaminoethyl ester hydriodide (penethamate hydriodide; "Mamyzin"). Bacteriological examination of quarter samples before and 14 days after treatment showed 55.3%,...

Heidrich, H. J.; Gramatzki, H.; Giesecke, W.
Berliner und Münchener Tierärztliche Wochenschrift, 1966, 79, pp 103-105