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English Abstract
Journal Article
Multicenter Study
[Muscoid dipterans as helminth eggs mechanical vectors at the zoological garden, Brazil].
Revista de Saúde Pública 2002 October
OBJECTIVE: To assess muscoid dipterae species who are able to carry helminth eggs and larvae and to evaluate the potential contamination of trapped dipterae.
METHODS: The study was conducted in two different sites of the Zoological Garden of Rio de Janeiro from May 1996 to April 1998. Flies were captured weekly using traps containing putrefied fish, left out in the open for an hour at two sites in the zoo: Site 1 was next to the garbage and Site 2 was near the hippopotamus and birds of prey cages. Of the 41,080 flies captured, Chrysomya megacephala was the most representative species (69.34%), followed by Chrysomya albiceps (11.22%), Musca domestica (7.15%), Chrysomya putoria (4.52%), Fannia sp. ( 3.12%), Ophyra sp. ( 2.53%), and Atherigona orientalis (2.08%). Captured flies had their body surface washed out with distilled water and their gut dissected.
RESULTS: Among the species studied, C. megacephala and M. domestica presented higher helminth eggs on their body surface and in their intestinal content. Ascaroidea and Trichinelloidea eggs prevailed in the intestinal content of C. megacephala. The helminth eggs found on the body surface and in the intestinal content were identified as Ascaris sp., Toxascaris sp., Toxocara sp., Trichuris sp., Capillaria sp., Oxyuridae, Trichostrongylidae and Acantocephala. Besides eggs it was also found helminth larvae on the body surface of flies. There were significant differences between the two different capture sites related to the number of helminth eggs found on the flies.
CONCLUSIONS: Faeces of zoo animals frequently found in their cages and in the zoo garbage contributed to the proliferation of muscoid dipterans who play an important role in spreading helminth eggs, mainly by direct contact of the flies' body with the animals' food.
METHODS: The study was conducted in two different sites of the Zoological Garden of Rio de Janeiro from May 1996 to April 1998. Flies were captured weekly using traps containing putrefied fish, left out in the open for an hour at two sites in the zoo: Site 1 was next to the garbage and Site 2 was near the hippopotamus and birds of prey cages. Of the 41,080 flies captured, Chrysomya megacephala was the most representative species (69.34%), followed by Chrysomya albiceps (11.22%), Musca domestica (7.15%), Chrysomya putoria (4.52%), Fannia sp. ( 3.12%), Ophyra sp. ( 2.53%), and Atherigona orientalis (2.08%). Captured flies had their body surface washed out with distilled water and their gut dissected.
RESULTS: Among the species studied, C. megacephala and M. domestica presented higher helminth eggs on their body surface and in their intestinal content. Ascaroidea and Trichinelloidea eggs prevailed in the intestinal content of C. megacephala. The helminth eggs found on the body surface and in the intestinal content were identified as Ascaris sp., Toxascaris sp., Toxocara sp., Trichuris sp., Capillaria sp., Oxyuridae, Trichostrongylidae and Acantocephala. Besides eggs it was also found helminth larvae on the body surface of flies. There were significant differences between the two different capture sites related to the number of helminth eggs found on the flies.
CONCLUSIONS: Faeces of zoo animals frequently found in their cages and in the zoo garbage contributed to the proliferation of muscoid dipterans who play an important role in spreading helminth eggs, mainly by direct contact of the flies' body with the animals' food.
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