An unusual salmonellosis in a herd of cattle: latent excretion of Salmonella Typhimurium DT 104 from the udder

Salmonella Typhimurium DT 104 was isolated within a routine bacteriological examination of samples of rawmilk. The following extended surrounding scre ening made sure that a clinical healthy cow, about 7 years old and with a m ilk yield of about 9 700 litres p. a., was the source of infection latently excreting the pathogen from the right hind quarter of the udder. Positive Salmonella-findings were also noted among the calves of the farm and two co -workers. The post mortem examination of this cow showed no pathological-an atomical changes. S. Typhimurium DT 104 could only be cultivated from the c orresponding teat secretion and mammary lymph node. According to the bacter iological results found in this herd there could possibly be a risk of infe ction for man and animal in case of direct marketing of milk from farm.