<i>Streptococcus agalactiae</i> virulence factors isolated from bovine mastitis and antibiotic treatment response

Torres, Giovanny; Macias, Diana; Reyes-Vélez, Julián; Rios-Agudelo, Paola; Caraballo-Guzmán, Arley

doi:10.1093/jambio/lxad116

Cited by 2 publications

(1 citation statement)

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“…The latest research, however, confirms its ability to survive in extra-mammary sources [58]. In mammary glands S. agalactiae also has the ability to survive by dint of forming biofilms [59] and as a variety of other bacteria becomes increasingly resistant to appropriate treatment [60]. The prevalence of S. agalactiae in bovine mastitis due to the introduction of the mastitis control programme [61,62] has dwindled in recent decades.…”

Section: Discussionmentioning

confidence: 99%

Molecular and phenotypic identification of bacterial species isolated from cows with mastitis from three regions of Poland

Dobrut,

Siemińska,

Sroka-Oleksiak

et al. 2024

BMC Vet Res

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Background Bovine mastitis is a widespread disease affecting dairy cattle worldwide and it generates substantial losses for dairy farmers. Mastitis may be caused by bacteria, fungi or algae. The most common species isolated from infected milk are, among others, Streptococcus spp., Escherichia coli, Staphylococcus aureus and non-aureus staphylococci and mammaliicocci. The aim of this paper is to determine the frequency of occurrence of bacterial species in milk samples from cows with mastitis from three regions of Poland: the north-east, the south-west and the south. To this end 203 milk samples taken from cows with a clinical form (CM) of mastitis (n = 100) and healthy animals (n = 103) were examined, which included culture on an appropriate medium followed by molecular detection of E. coli, S. aureus, Streptococcus agalactiae and Streptococcus uberis, as one of the most common species isolated from mastitis milk. Results The results obtained indicated that S. uberis was the most commonly cultivated CM species (38%, n = 38), followed by S. aureus (22%, n = 22), E. coli (21%, n = 21) and S. agalactiae (18%, n = 18). Similar frequencies in molecular methods were obtained for S. uberis (35.1%) and S. aureus (28.0%). The variation of sensitivity of both methods may be responsible for the differences in the E. coli (41.0%, p = 0.002) and S. agalactiae (5.0%, p = 0.004) detection rates. Significant differences in composition of species between three regions of Poland were noted for E. coli incidence (p < 0.001), in both the culture and molecular methods, but data obtained by the PCR method indicated that this species was the least common in north-eastern Poland, while the culture method showed that in north-eastern Poland E. coli was the most common species. Significant differences for the molecular method were also observed for S. uberis (p < 0.001) and S. aureus (p < 0.001). Both species were most common in southern and south-western Poland. Conclusions The results obtained confirm the need to introduce rapid molecular tests for veterinary diagnostics, as well as providing important epidemiological data, to the best of our knowledge data on Polish cows in selected areas of Poland is lacking.

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