Staphylococcus aureus

Staphylococcus aureus: Stap sector (staphylococci), large light pink colony colonies, number 4; Streptococcus parauberis: Strep sector (streptococci), small purple colonies, number 5.

Staphylococcus aureus is also called the "king of purulent processes". Biochemically, it is very active, produces a number of toxins, is well adapted to life on the skin and mucous membranes, and causes a number of pyogenic ( purulent) ingections in humans and animals. 

Staphylococcus aureus cna also reproduce well in foodstuff, tolerates high levels of table salt and some strains release large amounts of toxins into food, which cause vomiting and diarrrhea after ingestion.


Inflammation of the mammary gland caused by golden staphylococcus is acute and very chronic, there are various signs of inflammation, up to severe purulent mastitis. Staphylococcal inflamation of the mammary gland is often recurrent as S. aureus survives therapy in the upper mammary gland. 


Staphylococci are very resistant and therefore persist for a long time in the external enviroment. they also occur in healthy people, e.g. in the nasal cavity ( in 30-50% of people), on the skin, in a mixture od bacteria on tonsils, etc. If a person is healthy, staphylococci do not endanger them, but instead act as a training of the immune system.


Staphylococcus aureus is the second most common cause of mastitis in dairy cows in our conditions (15-20% of culture findings). The source of the bacterium is another infected cow, cracked gums of teat cups, where staphyloccoci survive; bacteria surviving in the external environment, but the source can also be a minor hand injury in milker, in which staphylococci reproduce.


Staphyloccoci are bacteria for which is typical the development of antibiotics resistance, and therefor it is necessary to quickly detect the causative agent of mastitis, examine the antibiogram (antibiotic sensitivity) and start targethed therapy. 


Staphylococcus aureus will grow on the on-farm PM test by the next day, the diagnosis can be confirmed by a cooperating laboratory, using the MALDI-TOF in an hour or two, and a sensitivity test can be done immediatelly, results being available by the next day - in good circumstances in total 48 hours.


It is important to determine the diagnosis of ingectious processes caused by the microorganism Staphylococcus aureus as soon as possible, given that the bacteria multiply rapidly (one division in about 20 minutes), produce enzymes and toxins and are very agressive in the udder tissue.