Many milk culture laboratories across the United States do not distinguish between environmental streptococci and Enterococcus spp. However, this document will address the inherent differences between these pathogens as ...

Streptococcus dysgalactiae is considered both a contagious and an environmental pathogen. These organisms can spread from cow to cow at milking time and are also commonly found in the cow's environment.

The control of S. uberis includes maintenance of a clean and dry housing environment and implementation of proper milking procedures

Strep. agalactiae is a contagious mastitis pathogen spread from cow to cow at milking. Proper milking procedures, including the use of efficacious pre- and post-milking teat disinfectants, will help to reduce the number ...

Staphylococcus aureus (S. aureus) mastitis is extremely difficult to control by treatment alone. To date, successful control is gained only through prevention of new infections and culling of infected animals.

Klebsiella spp. are environmental organisms. The most common, mastitis-causing species are Klebsiella pneumoniae and K. oxytoca, but treatment and control is similar for all species of Klebsiella.

Escherichia coli are Gram-negative bacteria, similar in structure to Klebsiella spp. E. coli mastitis is typically associated with a quick onset and often severe clinical signs.

Serratia spp. are Gram-negative bacteria that are similar in structure to Escherichia coli and Klebsiella spp. Serratia is resistant to most antibiotics; therefore, cure rates are very limited.

Lists types, source, control and treatment of mastitis-causing bacteria.

Mycoplasma is a tiny bacterium that can cause mastitis, metritis, pneumonia, drooped ears, and lameness in dairy cattle. While this bacterium has existed for more than 100 years, the current disease has only recently become ...