Bacterial Survival and Feeding Pattern in Hydrotaea Irritans: Two Essential Variables for a Transmission Model of Summer Mastitis

Thomas, Guy; Vecht, U.; Breeuwer, Johannes A. J.; Wisselink, Henk J.; Linden, J. N. van der

doi:10.1007/978-94-009-3373-6_20

Cited by 2 publications

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“…While it is not surprising that summer mastitis pathogens may be recovered from recently fed H.irritans caught around the teats of a sick animal, it is of interest that experimental infection of H . irritans has shown that summer mastitis pathogens may be recovered for several days after infection, and further that infected H.irritans are able to deposit summer mastitis pathogens during feeding on artificial media or teat skin (Wright & Titchener, 1977;, 1987Thomas et al, 1987b;Hillerton et al, 1990; Table 4). The period of time H.irritans may remain infected seems closely related to feeding time and meal size; when only incomplete meals are obtained A.pyogenes do not seem to survive in the gut for more than 3 days, whereas A.pyogenes has been reported to survive in flies fed to repletion for 1-2 weeks (Wright & Tichener, 1977;Thomas et al, 1987b;Hillerton et al, 1990) which corresponds to the findings presented here.…”

Section: Discussionmentioning

confidence: 99%

“…Subsequent studies have confirmed the carriage of the summer mastitis pathogens A .pyogenes, P.indolicus and Str. dysgaiactiae by H.irritans caught in the vicinity of cattle (H0i Ssrensen, 1974a;Madsen, 1985), and successful experimental infection of H.irritans with A.pyogenes, Str.dysgalactiae and Str.agalactiae has been achieved (Wright & Titchener, 1977Thomas et a / . , 1987b: Hillerton et al.…”

Section: Introductionmentioning

confidence: 99%

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Studies on the possible role of cattle nuisance flies, especially Hydrotaea irritans, in the transmission of summer mastitis in Denmark

Madsen

Sørensen²,

Nielsen

1991

Medical Vet Entomology

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The summer mastitis pathogens Actinomyces pyogenes, Peptococcus indolicus, Bacteroides melaninogenicus ss. levii, Fusobacterium necrophorum and Streptococcus dysgalactiae were isolated from the polyphagous symbovine dipterans Hydrotaea irritans (Fallén) and Morellia sp. caught around dairy heifers on pasture, but not from the haematophagous species Haematobia irritans (L.), Haematobosca stimulans (Meigen), Culicoides sp. and Simulium sp. Secretions from clinical cases of summer mastitis proved to be sources of summer mastitis bacteria for more than 3 weeks despite antibiotic treatment and teat amputation. Taking into account the seasonal activity pattern of Hydrotaea irritans and its topographical distribution on grazing cattle, it appears evident that this fly may play a central role in the establishment and maintenance of the bacterial contamination with summer mastitis pathogens on the teats of healthy cattle. In the present study the survival of A.pyogenes and P.indolicus for 7 days in experimentally infected Hydrotaea irritans, as demonstrated by the recovery of these microorganisms from agar plates exposed to live infected flies, is described. However, experimental transmission of summer mastitis from sick to healthy heifers by Hydrotaea irritans proved unsuccessful.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Studies on the possible role of cattle nuisance flies, especially Hydrotaea irritans, in the transmission of summer mastitis in Denmark

Madsen

Sørensen²,

Nielsen

1991

Medical Vet Entomology

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“…levii have been isolated from field-caught flies (Hoi Sorensen, 1974;Bramley et al, 1985;Madsen et al, 1991). Experimentally exposed flies can harbour vital summer mastitis pathogens up to 4 days after exposure (Thomas et al, 1987b;. Stuart&Parish(1955,1956),Tarryetal.…”

Section: Introductionmentioning

confidence: 99%

Summer mastitis experimentally induced by Hydrotaea irritans exposed to bacteria

Chirico

Jönsson

Kjellberg

et al. 1997

Medical Vet Entomology

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Summer mastitis is an acute suppurative bacterial infection of the udder in heifers and dry cows. To ascertain the possible role of flies in the transmission of the disease, experimental exposures of recipient heifers to Hydrotaea irritans previously exposed to bacteria were carried out. Flies were allowed to feed on secretions from clinical cases of summer mastitis. The pathogens present were the bacteria Staphylococcus aureus, Streptococcus dysgalactiae, Actinomyces pyogenes, Stuart-Schwan cocci, Peptococcus indolicus, Fusobacterium necrophorum and Bacterioides species. The teats of eight heifers were exposed to flies with verified pathogen content. Two teats of each animal were deliberately damaged before fly exposure. One teat was cut, another pricked with insect needles to mimic insect bites. Two of the heifers developed summer mastitis in the quarters where teats had been cut. The bacterial species isolated from these quarters corresponded to those that had previously been fed to the flies. For the first time, it is now demonstrated that H.irritans is capable of transmitting summer mastitis pathogens and so causing summer mastitis in recipient heifers. Lesions on the teat orifice may be a predisposing factor in the development of the disease.

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Bacterial Survival and Feeding Pattern in Hydrotaea Irritans: Two Essential Variables for a Transmission Model of Summer Mastitis

Cited by 2 publications

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Studies on the possible role of cattle nuisance flies, especially Hydrotaea irritans, in the transmission of summer mastitis in Denmark

Studies on the possible role of cattle nuisance flies, especially Hydrotaea irritans, in the transmission of summer mastitis in Denmark

Summer mastitis experimentally induced by Hydrotaea irritans exposed to bacteria

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