RESUMO
The microflora associated to furuncular lesions, larvae and pupae of Dermatobia hominis, as well as the relationships between parasite, host and microflora associated, as a comprehensive microsystem, has been studied. One hundred and two furuncular myiasis due to D. hominis larvae in several breeds of cattle were studied and the following bacterial species were significant: Staphylococcus aureus, S. epidermidis, S. warneri, Bacillus subtilis and Escherichia coli. Closely related, the microflora associated to 141 samples from first, second, third instar larva and both external surface and larval cavities has been studied. The representative associated microflora to the larvae were: S. aureus, B. subtilis, S. hycus and Moraxella phenylpiruvica, Moerella wisconsiensis, Proteus mirabilis and P. vulgaris, M. phenylpiruvica, M. wisconsiensis, P. mirabilis and P. rettgeri were the representative microflora associated to 64 pupae of D. hominis.
Assuntos
Animais , Bovinos , Bactérias , Dípteros , Doenças dos Bovinos/microbiologia , Furunculose , Miíase/microbiologia , Matadouros , Larva , Pupa , PeleRESUMO
The microflora associated to furuncular lesions, larvae and pupae of Dermatobia hominis, as well as the relationships between parasite, host and microflora associated, as a comprehensive microsystem, has been studied. One hundred and two furuncular myiasis due to D. hominis larvae in several breeds of cattle were studied and the following bacterial species were significant: Staphylococcus aureus, S. epidermidis, S. warneri, Bacillus subtilis and Escherichia coli. Closely related, the microflora associated to 141 samples from first, second, third instar larva and both external surface and larval cavities has been studied. The representative associated microflora to the larvae were: S. aureus, B. subtilis, S. hycus and Moraxella phenylpiruvica, Moerella wisconsiensis, Proteus mirabilis and P. vulgaris, M. phenylpiruvica, M. wisconsiensis, P. mirabilis and P. rettgeri were the representative microflora associated to 64 pupae of D. hominis.
Assuntos
Bactérias/isolamento & purificação , Doenças dos Bovinos/microbiologia , Dípteros , Furunculose/microbiologia , Miíase/microbiologia , Matadouros , Animais , Bovinos , Larva , Pupa , Pele/microbiologiaRESUMO
The isolated canine spleen was perfused at constant flow with continuous recording of splenic arterial perfusion pressure (SAPP) and spleen weight. Intra-arterial injections of the thromboxane A2 (TXA2) mimetic U46619 caused dose-related increases in splenic arterial perfusion pressure (SAPP) of short duration (ED50 0.31 nmol). There were very small changes in spleen weight accompanying any of the vasoconstrictor responses to U46619. The stable analogue of prostacyclin, iloprost, caused dose-dependent reductions in SAPP (ED50 1.3 nmol) indicating vasodilation. There were no changes in spleen weight to any doses of iloprost indicating a lack of action on capsular smooth muscle. Similarly, the nitric oxide (NO) mimetic sodium nitroprusside caused dose-related reductions in SAPP of short duration (ED50 5.8 nmol). No changes in spleen weight accompanied splenic vasodilator responses to any dose of sodium nitroprusside (SNP). The results indicate the potential actions and intrinsic potency of three endogenous vasoactive substances and provide information about their relative roles in the control of the splenic microcirculation in situations when they are released.
Assuntos
Iloprosta/farmacologia , Músculo Liso Vascular/efeitos dos fármacos , Músculo Liso/efeitos dos fármacos , Nitroprussiato/farmacologia , Endoperóxidos Sintéticos de Prostaglandinas/farmacologia , Baço/efeitos dos fármacos , Tromboxano A2/análogos & derivados , Vasoconstrição/efeitos dos fármacos , Vasoconstritores/farmacologia , Ácido 15-Hidroxi-11 alfa,9 alfa-(epoximetano)prosta-5,13-dienoico , Animais , Cães , Relação Dose-Resposta a Droga , Epinefrina/farmacologia , Feminino , Isoproterenol/farmacologia , Masculino , Tamanho do Órgão/efeitos dos fármacos , Perfusão , Baço/irrigação sanguínea , Baço/ultraestrutura , Tromboxano A2/farmacologiaRESUMO
The neotropical warble fly, Dermatobia hominis (Fig. 1), has plagued neotropical America since preColombian times, and has become an economically important pest causing substantial losses to the meat, milk and leather industries from northern Mexico down to northern Argentina. Its life cycle (Box 1) is astonishingly complex, requiring another insect as a phoretic carrier of its eggs to the skin of its mammal hosts. Here Eugenio Sancho discusses factors that contribute to the current economic and public health importance of this myiasis-causing fly.
Assuntos
Surtos de Doenças/veterinária , Doenças do Cão/epidemiologia , Gastroenterite/veterinária , Infecções por Parvoviridae/veterinária , Doença Aguda , Animais , Costa Rica , Cães , Gastroenterite/epidemiologia , Hemorragia Gastrointestinal/epidemiologia , Hemorragia Gastrointestinal/veterinária , Infecções por Parvoviridae/epidemiologiaRESUMO
Es la primera descripcion de un brote de gastroenteritis hemorragica aguda canina en Costa Rica. Se estudiaron doce perros con diarrea y vomitos, se les tomaron muestras de heces y de tejidos, destinadas tanto para microscopia de luz, como para microscopia electronica de barrido y de transmision. Macroscopica y microscopicamente se observaron grandes areas congestivas y hemoragicas en duodeno y yeyuno.Al microscopio de luz se observaron una marcada perdida y descamacion del epitelio de las vellosidades y dilatacion de las criptas. Con microscopia electronica de transmision y de barrido se observo una acentuada perdida de las microvellosidades,capilares con endotelio destruido, alteraciones en el microcaliz y en las mitocondrias. El analisis de las heces por microscopia electronica de transmision con tincion negativa, revelo la presencia de particulas virales semejantes a parvovirus, lo que confirma el diagnostico de gastroenteritis hemorragica aguda canina