Coagulase-Negative Staphylococci as an Etiologic Agent of Ovine Mastitis, with a Focus on Subclinical Forms

Abstract

The objective of this review is to investigate the distribution and the characteristics of coagulase-negative Staphylococci (CoNS) implicated in ovine mastitis, and especially in subclinical cases, in order to provide a global perspective of the current research data and analyze specific critical aspects of the issue. PRISMA guidelines were implemented in the search of the last 20 years of the related literature in two databases. In total, 139 studies were included in this review. Relevant data were tracked down, assembled, and compared. Regarding the geographical distribution, most studies originated from Europe (68), followed by South America (33). Lacaune was the most examined breed, while S. epidermidis was the predominantly identified species, representing approximately 39% of the obtained isolates. Antibiotic resistance in the relevant bacteria was documented mostly for Penicillin (32.8%) and Amoxicillin (32.1%), while biofilm- and toxin-associated genes were encountered in variable rates because significant inequalities were observed between different articles. Significantly higher rates of antimicrobial resistance were detected in Asia and South America compared to Europe. Finally, the diagnostic procedures carried out in the respective studies were evaluated. Conventional culture and biochemical tests were mostly performed for simple strain identification; therefore, further molecular investigation of isolates should be pursued in future studies, as this will provide important data regarding specific aspects of the implication of CoNS in ovine mastitis.

Characterization of a Ligilactobacillus salivarius Strain Isolated from a Cheese Seal Which Was Last Used in 1936

“…The metataxonomic analysis also detected DNA sequences at an abundance of ≥ 1% from the genera Staphylococcus, Ralstonia, Dialister, and Parvimonas. The genus Staphylococcus is the most abundant one in the core microbiota of milk from either healthy or mastitic ewes [59,60]. So far, there are no reports describing the presence of Ralstonia, Dialister, or Parvimonas DNA in ovine milk samples, although, Ralstonia sequences have been found in donkey and cow milk [61,62].…”

Food safety and food quality. Proceedings of the scientific papers

“…PSB skupina (× 10 3 buniek/ml) s krížovou kontamináciou medzi ľuďmi a zvieratami (Lysitsas et al, 2023). Potencionálne zdravotné riziko pre konzumentov predstavuje aj vysoká miera prevalencie S. aureus, ktorá je spojená s tvorbou enterotoxínov (Shalaby et al, 2024).…”