Chronic mastitis in cows caused by Streptococcus dysgalactiae: Case report

Abstract

Mastitis in dairy cows is an economically important disease because it makes up 38% of all diseases that occur in intensive cattle breeding. Mastitis affects milk production, either temporarily or permanently, depending on the course of infection and type of pathogen agent. Regular and timely therapy of mastitis based on the application antimicrobials, apart from prophylaxis, is very important for good health of breeding stock. This paper presents the case of repeated mastitis in a cow, Holstein-Friesian breed, 5 years old, which did not respond to antibiotic therapy. Milk samples from each separate quarter of the udder were collected under aseptic conditions and sent to the laboratory for further bacteriological tests, for isolation and identification of pathogens, as well as to test pathogen resistance to some antibiotics. On the basis of bacteriological examinations, there was confirmed the presence of Streptococcus dysgalactiae, which showed sensitivity to ampicillin, cloxacillin and augmentin, intermediate resistance to tetracycline and resis­tance to kotrimeksazol.(cotrimoxazole-proveriti).

Mastitis goveda predstavlja oboljenje koje izaziva najveće ekonomske gubitke kod mlečnih krava i čini 38% od svih oboljenja koja se javljaju u intezivnom uzgoju mlečnih krava. Mastitisi utiču na proizvodnju mleka, privremeno ili stalno u zavisnosti od toka infekcije i vrste uzročnika. Pravilna i pravovremena terapija supkliničkih mastitisa, zasnovana je na primeni antimikrobnih lekova i pored profilakse je ključna za dobro zdravstveno stanje zapata. U ovom radu je prikazan slučaj hroničnog mastitisa krave holštajn frizijske rase, starosti 5 godina, koja nije reagovala na antibiotsku terapiju. Uzorci mleka su uzeti u aseptičnim uslovima, iz svake četvrti pojedinačno, i poslati u laboratoriju radi izolacije i identifikacije uzročnika i ispitivanja osetljivosti uzročnika na antibiotike. Na osnovu detaljnih bakterioloških ispitivanja potvrđeno je prisustvo Streptococcus dysgalactiae (Strep. dysgalactiae) koji je pokazivao osetljivost na ampicilin, kloksacilin i augmentin, intermedijarnu osetljivost na tetraciklin, i rezistenciju na kotrimoksazol.