Filarídeo em bovideos: Morfologia e biologia na Ilha do Marajó.

Abstract

It is common the report on the occurrence of helminths in animals of production, given its sanitary and economic importance in Veterinary Medicine. The most common genera found are Haemonchus, Ostertagia, Cooperia, Trichostrongylus, Oesophagostomum, Paraphistomum, and a few others mentioned as Onchocerca and Setaria, the latter parasitoids in buffaloes and cattle from the Marajó archipelago are the focus of the present study. For this purpose, the carcass inspection and blood collection of 280 animals were inspected at the abattoirs of the Cooperative of the Livestock Industry of Pará (SOCIPE) and in the Municipal Abattoir of Soure. Slides were prepared with the blood of the hosts, which were stained with Panótico Rápido® and then analyzed under a light microscope. Adult helminths were collected and fixed with A.F.A solution (2% glacial acetic acid, 95% 3% formaldehyde and 70% GL ethanol) for 24 hours according to standard microscopic analysis and processing techniques. Adult parasites were found on the white viscera and on the serous layers of the host small intestines. The prevalence rate and mean parasitic intensity of Setaria in the hosts were respectively 25% and 1.1 for buffalo and 24% and 1.37 for cattle. Scanning electron microscopy evidenced characters not observed in light microscopy, such as hairy papillae near the oral capsule and amphidia in the anterior region, and the amount and arrangement of cloacal papillae in males. Light microscopy revealed the absence of microfilariae in the examination of the blood of bovine hosts. Regarding the taxonomic classification of the filarid helminths found in the present study, they showed characteristics of the Secernentea Class, Spirurida Order, Onchocercidae Family and Genus Setaria, Setaria labiatopapillosa species. This is the first report of Setaria labiatopapillosa parasitizing bovines in Marajó. However, further studies are needed to clarify the possible vectors involved in the cycle of these parasites, to adapt the techniques to identify the immature phases in the blood of the hosts, either with light techniques or molecular biology.