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Biology of Thelazia callipaeda (Spirurida, Thelaziidae) eyeworms in naturally infected definitive hosts

  • D. OTRANTO (a1), R. P. LIA (a1), V. BUONO (a1), D. TRAVERSA (a2) and A. GIANGASPERO (a3)...
Abstract

Thelazia callipaeda (Spirurida, Thelaziidae) eyeworm causes ocular infection in carnivores and humans in the Far East; this infection has been recently reported also in Europe – northern and southern Italy – in dogs, cats and foxes. The natural vector/s of T. callipaeda is/are unknown and the development of the nematode in its definitive hosts is limited to an experimental trial on dogs. To contribute new insights into the development of T. callipaeda in the definitive host in field conditions, eyeworms were collected from naturally infected dogs from an area with a high prevalence of infection (up to 60·14%) in the Basilicata region of southern Italy, from January 2002 to December 2003. Conjunctival secretions were also collected and examined for the presence of immature stages. The presence of blastomerized eggs throughout the period – except for the months from May to November – indicates a seasonality in the reproductive activity of T. callipaeda, coinciding with the presence/absence of the vector. In fact, 1st-stage larvae were found in the lachrymal secretions of dogs in summer (June–July 2002 and 2003), ready to be ingested by flies feeding about the eyes. The evidence of 4th-stage larvae in March 2002 and April, July and October 2003 may be accounted for by the presence of flies that act as intermediate hosts of T. callipaeda from early spring to early autumn. The presence of immature stages in October indicates an overlapping generation of nematodes and a 2nd cycle of vector infection. This basic knowledge of the development of T. callipaeda will hopefully help future epidemiological studies to identify the intermediate hosts and define the likely risk for vectors in field conditions.

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Corresponding author
Dipartimento di Sanità e Benessere animale, Facoltà di Medicina Veterinaria, Strada Provinciale per Casamassima Km. 3, P.O. Box 7, 70010, Valenzano (Bari), Italy. Tel./fax: +39 080 4679839. E-mail: d.otranto@veterinaria.uniba.it
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ANDERSON, R. C. ( 2000). Nematode Parasites of Vertebrates. Their Development and Transmission, pp. 428430. 2nd Edn. CABI Publishing, Guilford, UK.

CHIRICO, J. ( 1994). Prehibernating Musca autumnalis (Diptera: Muscidae) an overwintering host for parasitic nematodes. Veterinary Parasitology52, 279284.

GEDEN, C. J. & STOFFOLANO, J. G. ( 1981). Geographic range and temporal patterns of parasitization of Musca autumnalis De Geer by Thelazia spp. in Massachusetts with observation on Musca domestica as an unsuitable host. Journal of Medical Entomology18, 449456.

LYONS, E. T., SWERCZEK, T. W., TOLLIVER, S. C., BAIR, H. D., DRUDGE, J. H. & ENNIS, L. E. ( 2000). Prevalence of selected species of internal parasites in equids at necropsy in central Kentucky. Veterinary Parasitology92, 5162.

OTRANTO, D., FERROGLIO, E., LIA, R., TRAVERSA, D. & ROSSI, L. ( 2003a). Current status and epidemiological observations of Thelazia callipaeda (Spirurida, Thelaziidae) in dogs, cats and foxes in Italy: a ‘coincidence’ or a parasitic disease of the Old Continent? Veterinary Parasitology116, 315325.

OTRANTO, D., TARSITANO, E., TRAVERSA, D., DE LUCA, F. & GIANGASPERO, A. ( 2003c). Molecular epidemiological survey on the vectors of Thelazia gulosa, Thelazia rhodesi and Thelazia skrjabini (Spirurida: Thelaziidae). Parasitology127, 365373.

SHI, Y. E., HAN, J. J., YANG, W. Y. & WEI, D. X. ( 1988). Thelazia callipaeda (Nematoda: Spirurida): transmission by flies from dogs to children in Hubei, China. Transactions of the Royal Society of Tropical Medicine and Hygiene82, 627.

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Parasitology
  • ISSN: 0031-1820
  • EISSN: 1469-8161
  • URL: /core/journals/parasitology
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