Perfil De Sensibilidade Antimicrobiana De Agentes Contagiosos E Ambientais Isolados De Mastite Clínica E Subclínica De Búfalas

Dom, Rua; Medeiros, Manoel de

doi:10.1590/1808-1657v73p0172006

Cited by 9 publications

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“…O grupo Staphylococcus coagulase negativa também foi isolado em 12%, sendo que dentre esses, o S. Haemolyticus, fora isolado. S. coagulase negativo é comumente isolado e descrito como o agente principal em casos de mastite clínica e subclínicas (Cunha et al, 2006;Freitas et al, 2005;Silva, 2012) e associados em casos com intensidade leve e classificados como sendo bactérias oportunista (Philpot & Nickerson, 1991;Santos et al, 2011). Alguns autores por sua vez, diferem e classificam S. aureus com maior prevalência nas infecções (Brito et al, 2001).…”

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Principais agentes causadores de mastite clínica e subclínica em vacas leiteiras da região Oeste de Santa Catarina

Almeida

Piaia

Baldo

et al. 2021

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The objective of the study was to isolate and identify the main microorganisms that cause clinical and subclinical mastitis in dairy cattle in the West region of Santa Catarina and the sensitivity and resistance relationship of pathogens found by the antibiogram method, against the frequently used antimicrobials in treatments. Twenty-six samples of milk from bovines with mastitis disease were used, with distinction of race, age and weight, from small, medium and large farms. Clinical mastitis was identified by the clinical signs of edema, redness, increased temperature, hardening and pain in the mammary gland and subclinical mastitis was evidenced by the California Mastitis Test (CMT) and increased Somatic Cell Count (CCS). Thirteen microorganisms were identified, of which 12 (92%) were bacteria, the highest number of isolates belonging to the group of Staphylococcus ssp, Streptococcus ssp and Escherichia coli and one (8%) sample of yeast. The antibiogram identified the drugs with the most satisfactory sensitivity profile, being Amoxicillin, Ampicillin and Gentamicin with 83% of the samples showing sensitivity and the resistance of 58% of the samples facing the drug Oxacillin. The present study made possible the epidemiological survey and contribution to select the effective treatment, with reduced resistance to antibiotics.

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Section: Resultsunclassified

Principais agentes causadores de mastite clínica e subclínica em vacas leiteiras da região Oeste de Santa Catarina

Almeida

Piaia

Baldo

et al. 2021

Pubvet

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Antimicrobial resistance ofStaphylococcusspp. isolates from cases of mastitis in buffalo in Brazil

et al. 2011

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Abstract. Persistent buffalo mastitis caused by Staphylococcus spp. gives rise to economic losses and may be resistant to antimicrobial therapy. The aim of the present study was to determine resistance patterns and the presence of mecA, blaZ, and efflux pump in Staphylococcus spp. isolated from cases of mastitis in Brazilian buffalo herds. Susceptibility to antimicrobials was determined by the disk diffusion test and detection of the mecA and blaZ genes by polymerase chain reaction. The efflux pump screening test was performed by growing samples in Muller-Hinton agar containing ethidium bromide. The percentages for resistance to the drugs tested were: 71.8% to penicillin, 49.2% to amoxicillin, 65.8% to oxacillin, 62.3% to cefquinome, 44.7% to cephalonium, 45.2% to ciprofloxacin, 32.6% to enrofloxacin, 58.7% to erythromycin, 42.7% to florfenicol, 34.6% to gentamicin, 35.1% to trimethoprim-sulfamethoxazole, 8.5% to tetracycline + neomycin + bacitracin, 43.2% to cephalothin, 38.1% to streptomycin, 58.7% to tetracycline, 31.6% to norfloxacin, 45.2% to ceftriaxone, 43.2% to nitrofurantoin, 57.7% to doxycycline, and 53.7% to cephalexin. Simultaneous resistance to 4 or more antimicrobial drug groups was observed in 112 isolates, using the mecA (11) and blaZ (79) genes, and efflux pump (47). It is concluded that Staphylococcus spp. isolates from cases of mastitis in Brazilian buffalo show varying levels of resistance to antibiotics, and caution should be exercised in choosing therapeutics in order to minimize the risk to public health.

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Prevalência e etiologia da mastite bovina na bacia leiteira de Rondon do Pará, estado do Pará

et al. 2011

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RESUMO.-O objetivo do presente trabalho foi pesquisar a prevalência e a etiologia da mastite bovina na bacia leiteira do município de Rondon do Pará, bem como avaliar o perfil de sensibilidade e resistência dos agentes isolados frente aos antimicrobianos. The prevalence and the etiology of bovine mastitis in the dairy region of the county of Rondon of Pará were investigated. The sensibility and the resistance of the isolated agents to the antimicrobiotics was evaluetad; 237 mixed-bred milk cows were used on nine properties, which were hand milked once a day and kept on Brachiaria brizantha pasture, with supply of mineral salt and water ad libitum. Clinical examination of the mammary gland, the test of the sieve and California Mastitis Test were performed. Of the 935 examined mammary quarters, 6.6% had subclínical mastitis, 1.3% clinical mastitis, and 92.1% were negative. The isolated bacteria in the clinical mastitis were coagulase negative Staphylococcus spp. (25%), Staphylococcus aureus (16.7%), Streptococcus spp. (8,3%), and Corynebacterium spp. (8.3%). In the subclínical mastitis coagulase negative Staphylococcus spp. (32.3%), Staphylococcus aureus (17.7%), Staphylococcus intermedius (1.6%), Streptococcus spp. (4.8%), Corynebacterium spp. (4.8%), and coagulase negative Staphylococcus spp./S.aureus (1.6%) were isolated. There was no microbial growth in 41.7% of the samples with clinical mastitis and in 37.1% with subclínical mastitis. In the antibiogram, 100% of the isolated negative coagulase Staphylococcus spp., S. aureus, S. intermedius, and Streptococcus spp. were sensitive to sulfazotrim. On the other hand, Corynebacterium spp. were 100% resistant to this same antimicrobiotic. Cefalotina, cefoxitina and gentamicina were efficient against the isolated Staphylococcus spp. which represent the greater part of the mastitis agents in this study. Mastitis was diagnosed in all flocks studied, however the number of affected animals was considered low; this probably is due to low milk production of the cows and to permanence of the calf with the mother after milking, what favors emptying the mammary gland. But hygienic sanitary measures and management practices have to be improved.

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Perfil De Sensibilidade Antimicrobiana De Agentes Contagiosos E Ambientais Isolados De Mastite Clínica E Subclínica De Búfalas

Cited by 9 publications

References 1 publication

Principais agentes causadores de mastite clínica e subclínica em vacas leiteiras da região Oeste de Santa Catarina

Principais agentes causadores de mastite clínica e subclínica em vacas leiteiras da região Oeste de Santa Catarina

Antimicrobial resistance ofStaphylococcusspp. isolates from cases of mastitis in buffalo in Brazil

Prevalência e etiologia da mastite bovina na bacia leiteira de Rondon do Pará, estado do Pará

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