Treating mastitis in the cow - a tradition or an archaism

Hillerton, J.E.; Berry, Elizabeth A.

doi:10.1111/j.1365-2672.2005.02649.x

Cited by 138 publications

(124 citation statements)

References 14 publications

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“…Although antibiotic resistance patterns may reflect the antibiotics used for mastitis prevention and treatment, some authors (Hillerton & Berry 2005) defended the idea that convincing evidence is still lacking for supporting this theory. Studies performed in the United States indicate that there is no correlation among increased resistance of and antimicrobials that are commonly used in dairy cattle for treatment of mastitis (Erskine et al 2001, Makovec & Ruegg 2003.…”

Section: Discussionmentioning

confidence: 99%

Analysis of Escherichia coli isolated from bovine mastitic milk

Rangel¹,

Marin²

2009

Pesq. Vet. Bras.

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RESUMO.-[Análise de Escherichia coli isolada de leite de vacas com mastite.]A um longo tempo a mastite tem sido reconhecida como a doença que provoca as maiores perdas econômicas nos rebanhos leiteiros. De fevereiro a novembro de 2004, foram coletadas 670 amostras de leite mastítico de vacas, provenientes de dois estados brasileiros, das quais foram isoladas 231 cepas de Escherichia coli. Estas cepas foram analisadas para a detecção dos genes de produção de Shiga toxina (stx 1 e stx 2) e do gene da intimina (eae). Vinte cepas (8,6%) foram detectadas através de PCR como contendo os genes da Shiga toxina (8 stx 1, 12 stx 2 e nenhuma delas ambos os genes). Duas cepas (0,8%) de E. coli eram eae positivo não produtoras de Shiga toxina. As cepas de E. coli foram também examinadas para detectar a resistên-cia a 12 agentes antimicrobianos. As resistências mais freqüentes foram para tetraciclina (92,2%), estreptomicina (90,4%), ácido nalidixico (88,3%), amicacina (86,5%) e cefalotina (84,8%). A resistência a múltiplas drogas foi encontrada em 152 cepas (65,8%). TERMOS DE INDEXAÇÃO:Escherichia coli, mastite, agentes antimicrobianos, resistência a múltiplas drogas, STEC, gene eae. INTRODUCTIONMastitis remains a major cause of financial loss to the dairy industry and is considered to be economically the most important disease of dairy cattle (Hortet & Seegers 1998 Escherichia coli strains were isolated, were collected from two Brazilian states. The strains were screened for the presence of Shiga toxin-producing (stx 1 and stx 2) and intimin (eae) genes. Twenty (8.6%) strains were detected by PCR to harbor the Shiga toxin genes (8 the stx 1 gene, 12 the stx 2 gene and none both of them). Two (0.8%) of the Escherichia coli strains studied were eae positive non Shiga toxin-producing. The strains were also examined for resistance to 12 antimicrobial agents. The predominantly observed resistance was to tetracycline (92.2%), streptomycin (90.4%), nalidixic acid (88.3%), amikacin (86.5%) and cephalothin (84.8%). Multidrug resistance was found among 152 isolates (65.8%).

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Section: Discussionmentioning

confidence: 99%

Analysis of Escherichia coli isolated from bovine mastitic milk

Rangel¹,

Marin²

2009

Pesq. Vet. Bras.

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“…Etiology of bovine mastitis has changed in the last 40 years, 13 evolving from mastitis mainly caused by major contagious pathogens to mastitis caused by microorganisms that are found mostly in the environment or as part of the normal skin flora. Consideration of this evolving epidemiology of mastitis is important when deciding the best way to define and diagnose IMI.…”

Section: Discussionmentioning

confidence: 99%

“…13,25 Determination of the cause of intramammary infection (IMI) is typically accomplished by microbiologic culture of aseptically collected milk samples and interpretation of the culture results. 15 For research purposes, milk samples for microbiologic culture are commonly collected at a single milking or during separate milkings.…”

Section: Introductionmentioning

confidence: 99%

Diagnosis of Intramammary Infections at Dry-off Based on Sampling Strategy, Epidemiology of Pathogens, and Agreement Beyond Chance

2009

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Abstract. Isolation of pathogens from duplicate or multiple milk samples is currently considered the gold standard in diagnosis of bovine intramammary infections (IMI). However, in large field studies and especially in normal dairy production conditions, collection of single samples is often the most practical option to determine the causal agents of mastitis in a herd. The objective of the present study was to determine how well results between the first and the second sample in pairs of duplicate and successive quarter milk samples agree, using 5 different IMI definitions, based on the number of colony forming units (CFU) per milliliter of milk and epidemiology of the pathogens isolated. Agreement between microbiologic results from the first and the second sample of a pair was assessed by calculating the percentage of agreement and kappa coefficient. Milk samples collected at dry-off from 561 Holstein cows in 4 Ohio dairy herds were included in the analyses. Results of the study indicate that the agreement between the first and the second sample of a duplicate pair was high when criteria to call a sample positive was adjusted for the number of CFU/ml of milk by considering the epidemiology of different mastitis organisms. This finding suggests that an IMI can be accurately diagnosed with single samples. For contagious pathogens (Staphylococcus aureus) a cutoff of 100 CFU/ml and a cutoff of 1,000 CFU/ml for major environmental and minor pathogens will serve as a sensible approach to diagnose bovine IMI with single milk samples.

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“…La mastitis bovina subclínica, se caracteriza por no presentar signos clínicos visibles en MEDICINA VETERINARIA Y ZOOTECNIA el animal, pero si disminución en la producción láctea y un conteo elevado de células somáticas (Hillerton et al, 2005 (Pellegrino et al, 2011) son microorganismos transmitidos de vaca a vaca a través de las manos del ordeñador, las toallas de secado utilizadas para limpiar los pezones, la leche residual en las pezoneras o un equipo de ordeño con inadecuada desinfección que alberga los patógenos, es decir, se transmiten estos patógenos como consecuencia de una mala rutina de ordeño (Radostits et al, 2002). Las La mastitis subclínica afecta el estado de la salud de la ubre que, para la industria láctea, es medida en la cantidad de células somáticas (RCS) de la leche, que se traduce en productos de menor calidad, menor tiempo de vida en anaquel y el acceso restringido a mercados internacionales con estándares más exigentes (Gasque y Blanco, 2001).…”

Section: Introductionunclassified

Microorganismos aislados en cultivo bacteriológico de muestras de leche de vacas holstein clínicamente sanas

Jaramillo

Zuluaga

Ángel

et al. 2018

Ces. Med. Vet. Zootec.

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A microbiological analysis was performed to determine the frequency of isolation of microorganisms of infectious and environmental type in milk from a group of clinically healthy cows in two different types of milking (manual and mechanical). To each sample of milk was made bacteriological culture to determine the presence of microorganisms. Of 289 milk samples evaluated, 193 (66.78%) were positive for isolation of any type of pathogen, of which 81 (28.02%) samples came from manual milking and 112 (38.75%) belonged to mechanical milking, finding a higher percentage of isolation of bacterial pathogens in milks coming from mechanical milking system (p = 0.0236). The most isolated pathogen was the Arcanobacterium haemolyticum, A microorganism that forms part of the saprophytic flora of the animal, with an individual presence in 20.14% and in coinfection with other pathogens in 0.7% of the samples. The most common microorganism of subclinical mastitis in cattle is Streptococcus agalactiae, which in the present study was isolated from 12.50% of milk samples. The odds ratio (OR) between the isolation of Streptococcus agalactiae and the Somatic Cell Score (SCS) was determined, which was statistically significant, indicating that when this pathogen is present the SCS increases and the animals are more susceptible to mastitis.

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Treating mastitis in the cow - a tradition or an archaism

Cited by 138 publications

References 14 publications

Analysis of Escherichia coli isolated from bovine mastitic milk

Analysis of Escherichia coli isolated from bovine mastitic milk

Diagnosis of Intramammary Infections at Dry-off Based on Sampling Strategy, Epidemiology of Pathogens, and Agreement Beyond Chance

Microorganismos aislados en cultivo bacteriológico de muestras de leche de vacas holstein clínicamente sanas

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