Abstract
A parasitological survey for Metagonimus yokogawai metacercariae was carried out by examining a total of 321 freshwater fish comprising of 7 species. Of the 321 fish samples examined, 182 (56.7 %) were found to be infected with M. yokogawai metacercariae. The prevalence of M. yokogawai metacercariae in Opsariichthys pachycephalus was 93.4 % (86/92), Zacco platypus 75.0 % (30/40), Distoechodon turmirostris 61.3 % (38/62), Varicorhinus barbatulus 56.5 % (13/23), Hemibarbus labeo 33.3 % (1/3), Acrossocheilus formosanus 15.9 % (14/88), and 0 % in Sinibrama macrops (0/13), respectively. This is the first record of M. yokogawai infection in Z. platypus, D. turmirostris, V. barbatulus, and H. labeo in Taiwan. The major site of predilection of the metacercariae in the fishes was in the scale, but some metacercariae were also observed in the flesh and fins. The M. yokogawai metacercariae were orally inoculated into mice, rat, gerbil, and golden hamster to study their infectivity and also to obtain the adult worms for taxonomic study. Worm recovery in hamsters was 75.3 %, in mice was 70.0 %, in rats was 23.3 %, and in gerbils was 6.0 %, respectively. Moreover, larger worms were recovered from the golden hamster. Golden hamster was thus found to be the most susceptible experimental rodent host for the infectivity study of Metagonimus. Besides M. yokogawai, metacercariae of Centrocestus formosanus was also observed in the fishes examined.
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Acknowledgment
This study was supported partially by a grant (CTU101-P-01) from Central Taiwan University of Science and Technology, Taiwan.
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Li, MH., Huang, HI., Chen, PL. et al. Metagonimus yokogawai: metacercariae survey in fishes and its development to adult worms in various rodents. Parasitol Res 112, 1647–1653 (2013). https://doi.org/10.1007/s00436-013-3320-8
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DOI: https://doi.org/10.1007/s00436-013-3320-8