Angiostrongylus cantonensis: Experimental study on the susceptibility of apple snails, Pomacea canaliculata compared to Pila polita

Six groups (15 snails/group) of Pomacea canaliculata and Pila polita were infected orally with 0 (control), 200, 400, 800, 1600 and 3200 first-stage Angiostrongylus cantonensis larvae (L1). The respective mean ± SD third stage larvae (L3) worm recovery 1-month post-infection (p.i.) for P. canaliculata was 0, 1.4 ± 5.42 (0.7%), 0.13 ± 0.35 (0.03%), 0.07 ± 0.26 (0.009%), 0.07 ± 0.26 (0.004%), 0, and for P. polita 0, 64.33 ± 21.38 (32.25%), 115.36 ± 36.82 (28.93%), 265.33 ± 90.01 (33.27%), 471.33 ± 92.98 (29.60%) and 849.00 ± 243.23 (26.61%). The susceptibility of A. cantonensis in P. polita was dose-dependent (p < 0.001). In the three groups (nine snails/group) of P. polita given 500 L1, we studied the distribution of L3 in the internal organs (i.e., foot, head + esophagus, kidney, albumin gland, mantle, intestine, digestive gland) and found the highest density after 1, 2 and 3 months p.i. in the mantle at 29.37%, 31.09% and 37.45%. The infection rate in P. canaliculata was too low to study distribution rates.