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The occurrence of Toxocara malaysiensis in cats in China, confirmed by sequence-based analyses of ribosomal DNA


Non-isotopic polymerase chain reaction (PCR)-based single-strand conformation polymorphism and sequence analyses of the second internal transcribed spacer (ITS-2) of nuclear ribosomal DNA (rDNA) were utilized to genetically characterise ascaridoids from dogs and cats from China by comparison with those from other countries. The study showed that Toxocara canis, Toxocara cati, and Toxascaris leonina from China were genetically the same as those from other geographical origins. Specimens from cats from Guangzhou, China, which were morphologically consistent with Toxocara malaysiensis, were the same genetically as those from Malaysia, with the exception of a polymorphism in the ITS-2 but no unequivocal sequence difference. This is the first report of T. malaysiensis in cats outside of Malaysia (from where it was originally described), supporting the proposal that this species has a broader geographical distribution. The molecular approach employed provides a powerful tool for elucidating the biology, epidemiology, and zoonotic significance of T. malaysiensis.

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  1. Ash LR (1962) Helminth parasites of dogs and cats in Hawaii. J Parasitol 48:63–65

  2. Baker MK, Lange L, Verster A, van der Plaat S (1989) A survey of helminths in domestic cats in the Pretoria area of Transvaal, Republic of South Africa. Part 1: the prevalence and comparison of burdens of helminths in adult and juvenile cats. J S Afr Vet Assoc 60:139–142

  3. Cypess RH (1982) Visceral larva migrans. In: Steele JH (ed) CRC Handbook series in zoonoses. Section C: Parasitic zoonoses, vol 2. CRC, Boca Raton, pp 205–212

  4. Despommier D (2003) Toxocariasis: clinical aspects, epidemiology, medical ecology, and molecular aspects. Clin Microbiol Rev 16:265–272

  5. Fisher M (2003) Toxocara cati: an underestimated zoonotic agent. Trends Parasitol 19:167–170

  6. Gasser RB, Zhu XQ, Jacobs DE, Hu M, Chilton NB (2006) Molecular genetic characterisation of members of the genus Toxocara (Nematoda: Ascaridoidea)—toxonomic, population genetic and epidemiological considerations. In: Holland C, Smith H (eds) Toxocara: the enigmatic parasite. CABI Publishing, Wallingford, pp 18–31

  7. Gibbons LM, Jacobs DE, Sani RA (2001) Toxocara malaysiensis n. sp. (Nematoda: Ascaridoidea) from the domestic cat (Felis catus Linnaeus, 1758). J Parasitol 87:660–665

  8. Hitchcock DJ (1953) Incidence of gastro-intestinal parasites in some Michigan kittens. N Am Vet 34:428–429

  9. Jacobs DE, Zhu XQ, Gasser RB, Chilton NB (1997) PCR-based methods for identification of potentially zoonotic ascaridoid parasites of the dog, fox and cat. Acta Trop 68:191–200

  10. Lee CC, Cheng NABY, Bohari Y (1993) Toxocara canis from domestic cats in Kuala Lumpur. Trop Biomed 10:79–80

  11. Li AX, Wu XY, Xie MQ, Lin RQ, Gasser RB, Zhu XQ (2005) PCR-based Identification and delineation of members within the Pseudorhabdosynochus lantauensis complex (Monogenea: Diplectanidae). Parasitol Res 98:34–37

  12. Miyazaki I (1994) An illustrated book of helminthic zoonoses. International Medical Foundation of Japan, Tokyo

  13. Parsons JC (1987) Ascarid infections of cats and dogs. Vet Clin North Am Small Anim Pract 17:1307–1339

  14. Pawlowski Z (2001) Toxocariasis in humans: clinical expression and treatment dilemma. J Helminthol 75:299–305

  15. Rohde K (1962) Helminths of cats and dogs in Malaya. In: UNESCO—1st regional symposium on scientific knowledge of tropical parasites. University of Singapore, Singapore, pp 207–216

  16. Schantz PM (1991) Parasitic zoonoses in perspective. Int J Parasitol 21:161–170

  17. Skrjabin KI, Shikhobalova NP, Mozgovoi AA (1991) Oxyurata and Ascaridata. In: Skrjabin KI (ed) Key to parasitic nematodes, vol. 2. Amerind Publishing, New Delhi

  18. Smith HV (1993) Antibody reactivity in human toxocariasis. In: Lewis JW, Maizels RM (eds) Toxocara and toxocariasis: clinical, epidemiological and molecular perspectives. Institute of Biology, London, pp 91–110

  19. Sprent JFA (1956) The life history and development of Toxocara cati (Shrank 1788) in the domestic cat. Parasitology 46:54–78

  20. Sprent JFA (1958) Observations on the development of Toxocara canis (Werner, 1782) in the dog. Parasitology 48:184–208

  21. Sprent JFA, Barrett MG (1964) Large roundworms of dogs and cats: differentiation of Toxocara canis and Toxascaris leonina. Aust Vet J 40:166–171

  22. Taylor MRH (1993) Toxocariasis in Ireland. In: Lewis JW, Maizels RM (eds) Toxocara and toxocariasis: clinical, epidemiological and molecular perspectives. Institute of Biology, London, pp 71–80

  23. Thompson RCA (1994) Workshop summary: parasitic zoonoses—new issues. Vet Parasitol 54:291–294

  24. Vidal JE, Sztajnbok J, Seguro AC (2003) Eosinophilic meningoencephalitis due to Toxocara canis: case report and review of the literature. Am J Trop Med Hyg 69:341–343

  25. Zhu XQ, Jacobs DE, Chilton NB, Sani RA, Cheng NABY, Gasser RB (1998) Molecular characterization of a Toxocara variant from cats in Kuala Lumpur, Malaysia. Parasitology 117:155–164

  26. Zhu XQ, Chilton NB, Jacobs DE, Boes J, Gasser RB (1999) Characterisation of Ascaris from human and pig hosts by nuclear ribosomal DNA sequences. Int J Parasitol 29:469–478

  27. Zhu XQ, D’Amelio S, Paggi L, Gasser RB (2000) Assessing sequence variation in the internal transcribed spacers of ribosomal DNA within and among members of the Contracaecum osculatum complex (Nematoda: Ascaridoidea: Anisakidae). Parasitol Res 86:677–683

  28. Zhu XQ, D’Amelio S, Palm HW, Paggi L, George-Nascimento M, Gasser RB (2002) SSCP-based identification of members within the Pseudoterranova decipiens complex (Nematoda: Ascaridoidea: Anisakidae) using genetic markers in the internal transcribed spacers of ribosomal DNA. Parasitology 124:615–623

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Correspondence to Xing-Quan Zhu.

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Li, M., Zhu, X., Gasser, R.B. et al. The occurrence of Toxocara malaysiensis in cats in China, confirmed by sequence-based analyses of ribosomal DNA. Parasitol Res 99, 554–557 (2006).

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  • Canis
  • Toxocariasis
  • Visceral Larva Migrans
  • SSCP Profile
  • Ocular Larva Migrans