Klebsiella pneumoniae is a bacterium belonging to the group of so-called enterobacteria, which occur naturally in the intestines of humans and animals. Other causes of masitis include Enterobacter cloaceae, Enterobacter aglomerans, Proteus vulgaris, Serratia marcescens and Serratia odorifera. These are gram-negative rods that grow on a Petri dish in the PM test in the sector marked G-. Collectively, these mastitis are called enterobacterial mastitis - they have a severe acute course with very serious clinical symptoms. These microorganisms are found naturally in feces and therefore in litter, udder skin, etc. They enter the mammary gland through an open teat canal, through a milking device - such as a fluctuating vacuum, but also by blood transfer from the digestive tract and minor skin lesions of the mammary gland. Clinically, the disease often breaks out under the influence of adverse factors that weaken the resistance of the dairy cow (stress, change of feeding ...)
Clinical symptoms are usually severe - fever, muscle tremors, anorexia, chewing arrest, diarrhea and bedtime, often ending in death within 24 hours.
Sometimes Klebsiella pneumoniae infection occurs as chronic mastitis without general disruption. Latent infections have even been reported.
However, in the case of mastitis caused by bacteria from the group of enterobacteria, it is always necessary to take into account the acute and severe course.