Streptococcus uberis

Strep sector (streptococci) - small dark blue colonies, number 1

Following the suppression of Streptococcus agalactiae and Staphylococcus aureus in breeding, Streptococcus uberis is the most common cause of dairy cow mastitis. Inflammation of the mammary gland usually has a creeping development, complicated treatment and frequent recurrent infections. Streptococcus uberis has the ability to gradually attack quarters of the mammary gland one after the other, and we often see infection at different stages of development in in several quarters at once. 

In the past, Streptococcus uberis was considered and so-called environmental causative agent, which causes mostly subclinical mastitis of chronic nature. 

According to the current view, there are several strains of these contact-spreading streptococci, and in 1990 was discovered a new species of Streptococcus parauberis, which is more addressive, has the ability to destroy the udder tissue and has higher antibiotic resistance.


The increase in the number of mastitis caused by the bacteria Streptococcus uberis occurs due to several factors: poor hygiene, stress, decreased immune system function.

Also, in cases where mastitis is detected in breeding, the therapy is set "uniformly" - targeting the most serious pathogene (e.g. Staphylococcus aureus acute mastits,...), a treatment protocol for staphylococci is introduced, which recedes as the original dominant pathogen, and the Streptococcus uberis survives, spreads in the herd and the time of occurance of a high number of recurrent mastitis occurds.