Helisoma trivolvis: intermediate host of Angiostrongylus costaricensis
H. trivolvis, a snail widespread in lentic and lotic waters in Costa Rica, was susceptible to experimental infection with first-stage larvae of A. costaricensis. Mean numbers of 3rd-stage larvae produced by lots of 24 snails from laboratory culture and from Capellades, Corios and Estero Lagartero, were 5.68, 5.33, 18.5 and 12.0 respectively. The mean number from Biomphalaria glabrata infected in the same way was 55.75. Of 84 one-month-old H. trivolvis exposed to infection, 39 survived and 28 were infected. Corresponding figures for 48 two-, 24 three-, 72 four- and 13 five-month-old snails were 32 and 22, 18 and 6, 6 and 5, and 12 and 12. Thirty-three snails infected at 1 month old produced a mean of 6.90 3rd-stage larvae, 22 infected at 2 months produced 6.22 and 10 infected at 4 months produced 10.2. Only 1 H. trivolvis collected in Estero Lagartero was naturally infected with A. costaricensis. The authors conclude that H. trivolvis is a possible, though low grade, intermediate host for A. costaricensis but that it may become important since it is prevalent in central Costa Rica which has the greatest human population density.
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| Format: | biblioteca |
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1987
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| Subjects: | ANGIOSTRONGYLUS, NEMATODA, HUESPEDES INTERMEDIARIOS, ORGANISMOS ACUATICOS, TRANSMISION DE ENFERMEDADES, |
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