Bovin laitier / Dairy cattle

Maldi Tof and coagulase negative Staphylococci (CNS)

Since we started using our new Maldi Tof bacterial identification device, we have received many questions regarding the

Maldi-Tof petriSince we started using our new Maldi Tof bacterial identification device, we have received many questions regarding the interpretation of testing reports mentioning various species of Staphylococci, such as S. chromogenes, S. simulans, S. xylosus, S. haemolyticus, S. epidermidis, S. cohni or S. sciuri.

Before using the Maldi Tof device, we reported these species under the generic term “Staphylococcus spp” because we could not identify them accurately. In the scientific literature, these species are also often referred to as “coagulase-negative staphylococci“. About 25 species of these species have been isolated from milk samples, the most common being those cited above.

Although Staphylococci spp. are the bacterial species most frequently isolated from milk samples, they have long been considered as minor pathogens. However, recent studies suggest that different species may differ in their epidemiology and virulence. For example, S. chromogenes, S. simulans and S. xylosus would increase the somatic cell counts. S. epidermidis would be adapted to the udder, whereas S. haemolyticus would have an environmental origin.

The precise identification of these different species made possible by the use of Maldi Tof technology should ultimately help you to better understand their relative importance in your herds and adapt your control tools accordingly.

For further information, feel free to contact us.

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