Estudos complementares da infecção por Mannheimia granulomatis (lechiguana) em bovinos

Pereira, Daniela Isabel Brayer; Riet-Correa, Franklin; Ladeira, Sílvia Regina Leal

doi:10.1590/s0100-736x2000000300001

Cited by 4 publications

(1 citation statement)

References 7 publications

(16 reference statements)

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“…Na lechiguana alguns abscessos são circundados por células epitelióides, formando pequenos granulomas com rosetas contendo bactérias em seus centros. As projeções radialmente arranjadas na periferia das rosetas são similares ao material Splendore-Hoeppli (Ladeira et al, 1996;Pereira et al, 2000;Riet-Correa et al, 2000).…”

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Efeito da Mannheimia granulomatis sobre cultivo de fibroblastos

Ladeira

Gomes

Vidor

et al. 2008

Arq. Bras. Med. Vet. Zootec.

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Efeito da Mannheimia granulomatis sobre cultivo de fibroblastos

Ladeira

Gomes

Vidor

et al. 2008

Arq. Bras. Med. Vet. Zootec.

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Pathological aspects of bovine focal fibrogranulomatous proliferative panniculitis (Lechiguana)

et al. 2015

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Lechiguana is a disease of cattle caused by an interaction between Dermatobia hominis warble and the bacteria Manheimia granulomatis. It is characterized by subcutaneous swellings that grow rapidly and result in death after 3 to 8 months. The objective of this paper was to investigate some vascular and fibrogenic changes of the disease at different lesion stages by histochemical and immunohistochemical techniques. A peculiar histopathological aspect observed during a proliferative phase (before treatment) was the intense vasculitis, described as degenerative and fibro-proliferative, expressed by the oncogene p53, possibly caused by the presence of bacteria in close contact with enthotelial cells, along with dense accumulations of lymphoid cells around venules. The synthesis of collagen fibers during the development of Lechiguana lesions assume a structural aspect of star arrangement with fiber radiation centers that gradually interconnect to design the Extracellular Matrix (ECM) framework, seen by Confocal Laser Scanning Microscopy (CSLM). Angiogenesis was the most characteristic finding in both proliferative and regressive stages as seen by the immunohistochemical expression of cytoskeleton proteins and von Willebrand (Factor VIII-Related Antigen). Additionally, in all tissues samples, active ECM elements like Metalloproteinases (MMPs), Tissue Inhibitors Metalloproteinases (TIMP) and Fibronectin (FN) were mainly associated to vessels structures. The extraordinary regression of exuberant granulation tissue after treatment is undoubtedly associated to the maintenance of the vascular components observed during the regressive phase.

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Control of Dermatobia hominis larvae by manual extraction is effective and does not cause abscesso

Ribas,

Veríssimo,

Gutmanis

et al. 2023

Pesq. Vet. Bras.

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In order to study alternative ways of control of Dermatobia hominis fly larvae, three processes were tested: T1, cypermethrin 5% + chlorpyrifos 7% + citronellal 0.5% (Pour on); T2, trichlorfon powder dissolved at 2% in burnt oil passed on the nodules; T3, manual larva extraction. The study was conducted at Instituto de Zootecnia in Nova Odessa, São Paulo State, Brazil. In a dairy herd of 176 animals, 29 with at least one larvae were found, distributed in the three treatments. Each treatment’s efficacy percentage was based on the number of live botflies present after 14 days. The animals were observed on days +4, +7, +14 and +21, and new botflies and abscesses were annotated. All treatments presented high effectiveness (above 98%). New botflies were already seen in the first week after applying the three treatments, and on day 21, two abscesses in each chemical treatment were observed. Larva extraction was 100% effective, with no originating abscesses, and should be encouraged in small and medium-sized properties and those with resistant botflies to chemical products.

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Estudos complementares da infecção por Mannheimia granulomatis (lechiguana) em bovinos

Abstract: Pesq. Vet. Bras. 20(3):91-96, jul./set. 2000

Cited by 4 publications

References 7 publications

Efeito da Mannheimia granulomatis sobre cultivo de fibroblastos

Efeito da Mannheimia granulomatis sobre cultivo de fibroblastos

Pathological aspects of bovine focal fibrogranulomatous proliferative panniculitis (Lechiguana)

Control of Dermatobia hominis larvae by manual extraction is effective and does not cause abscesso

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