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2024
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- IOC - Artigos de Periódicos [12821]
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LARVAL TREMATODES HOSTED BY BIOMPHALARIA STRAMINEA IN THE BRAZILIAN SEMIARID REGION: IMPLICATIONS FOR SCHISTOSOMIASIS CONTROL
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Abstract
The present study aimed to identify larval trematodes shed by snails found in water bodies
used by urban communities in a former schistosomiasis endemic area in the state of Piauí,
in the Brazilian semiarid region. A malacological survey was performed followed by analysis
of the cercariae shed by the snails after light exposure. Biomphalaria straminea specimens
(n=1,224) were obtained from all seven collection sites. Cercariae shed by snails were i)
single tailed, in which one type of cercariae was identified (Echinostoma cercariae), and ii)
with bifurcated tail (brevifurcate apharyngeate distome, brevifurcate pharyngeate distome,
and longifurcate pharyngeate distome [strigeocercaria]). Brevifurcate apharyngeate distome
were further examined and the presence of spikes in swimming membranes enabled the
identification of Spirorchiidae cercariae in all individuals, demonstrating the absence of
cercariae compatible with Schistosoma mansoni. Nevertheless, the accurate diagnosis of S.
mansoni circulation in former endemic areas is still necessary.
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