Enterococcus faecalis

Enterococcus faecalis: Strep sector (small streptococci), small purple colonies, designated No. 5; Staphylococcus succinus: Stap sector (staphylococci), small bright green colonies, number 6; Serratia liquefaciens: sector G- (gram-negative rods), small colonies of blue color, No 4.

Enterococci are bacteria, that are commonly found in the digestive tract of humans and animals, enter the enviroment along with  feces and then enter the mammary gland through the teat canal.

Dairy mastitis can be caused by the following species:

Enterococcus faecalis,

Enterococcus bovis,

Enterococcus equinus.

These are usually subclinical mastitis, but may be mastitis with clinical symptoms. 


Enterococci are relatively resistant bacteria. They remain in the enviroment and are also able to survive longer in the mammaey gland. They are quite resistand to higher temperatures (thermostable) and even pasteurization of milk does not destroy them, only demages them.

The proportion of mastitis caused by enerococci varies depending on predisposing factors in animals, herd size, compliance with hygiene principles, etc.

Microbiological mammary gland secretion test is necessary to determine the correct diagnosis. On the PM test the bacteria grow in pink-purple colonies, with a lighter peak in the sector for the streptococci (strep) - see photo.

Considering their increased resistance to antibiotics, confirmation of MALDI-TOF or another bacteriological method and, in particular, examination of antibiotics sensitivity is appropriate. All examinations can be performed in our cooperating laboratory.

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