[Klebsiella pneumoniae mastitis as a dairying problem].

Quarter samples were taken from lactating and dry cows of a dairy herd in the Netherlands. Klebsiella pneumoniae was isolated from milk and dry udder secretum of cattle, and from the bedding of the cubicles. The animals concerned did not show any clinical symptoms. For some years Klebsiella mastitis caused severe problems on this farm. A strict hygienic program resulted in complete control of the disease. Diagnostics, therapy and prevention of Klebsiella mastitis are discussed.