Perfil de sensibilidade e casuística do Streptococcus dysgalactiae em mastites na região Noroeste do Estado do RS

Abstract

The bacterium Streptococcus dysgalactiae is part of the group of streptococci, classified as Gram-positive cocci. Found mainly in the oral cavity, genitalia and in the skin of the mammary gland of animals and in its permanent environment, it is classified as an environmental pathogen, which is characterized as an opportunistic invader of the udder. Mastitis caused by this agent, usually presents in the clinical form of the disease, with infections of acute and severe character. The objective of this work was to identify the bacterial agent that causes bovine mastitis in the Northwest region of the State of Rio Grande do Sul, to isolate Streptococcus dysgalactiae and to determine its sensitivity profile against the main antimicrobials used in this region for the treatment of bovine mastitis. 917 mastitic milk samples were received for culture and antibiogram examination at the Veterinary Microbiology Laboratory of Unijuí, from January 2012 to May 2018. Streptococcus dysgalactiae, responsible for causing environmental mastitis, mainly of an acute nature, was isolated in 9 cases of mastitis, presenting a sensitivity profile, with high antimicrobial efficiency (100% sensitivity) for ciprofloxacin, cephalothin, enrofloxacin, gentamicin, norfloxacin and sulfazotrim. Thus, it is concluded that the prevalence of bovine mastitis caused by environmental agents, among them S. dysgalactiae in the Northwest region of the State of Rio Grande do Sul is high.

Saúde da Glândula Mamária de Vacas em Lactação: Revisão de Literatura

“…A mastite ambiental é causada por agentes patogênicos oportunistas, que se encontram no ambiente no qual ficam os animais, como o local da ordenha, no chão, em camas com materiais contaminados, nas fezes e até na água (MASSOTE et al, 2019). Além da transmissão ocorrer no momento da ordenha, a mastite ambiental tem como transmissão o momento entre ordenhas, sendo causada principalmente pelos micro-organismos Echerichia coli e Streptococcus uberis (ULSENHEIMER et al, 2020).…”

Virulence factors, antimicrobial resistance and phylogeny of bovine mastitis-associatedStreptococcus dysgalactiae

“…Mastitis caused by Streptococcus dysgalactiae is usually identified in the clinical form of the disease and has been reported in many different countries (Vélez et al ., 2017; Tian et al ., 2019). Clinical mastitis causes an increase in the somatic cells of the mammary gland, and has greater incidence during the postpartum period and the rainy season (Ulsenheimer et al ., 2020). Cows infected with mastitis-causing S. dysgalactiae can infect healthy cows, likewise, S. dysgalactiae present in the environment can also infect the herd.…”