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Effects of temperature and humidity on the development of eggs of Toxocara canis under laboratory conditions

Published online by Cambridge University Press:  12 April 2024

M.I. Gamboa
M.I. Gamboa*
Affiliation:
Centro de Estudios Parasitológicos y de Vectores (CEPAVE), Calle 2, no. 584, La Plata, 1900, Argentina
*
*Fax: +54 221 4232327 E-mail: inesgamboa@cepave.com.ar
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Abstract

The influence of temperature and humidity on the survival and development of Toxocara canis eggs in an in vitro model system was investigated. Two soil samples were inoculated with T. canis eggs and maintained at 3% and 50% humidity and temperatures of 19–24°C. Nine soil samples were inoculated with T. canis eggs of which three samples were kept at 4°C with humidities at 3%, 15%, and 30%; three were maintained at 21°C and three more were incubated at 34°C, and at the same three humidity levels. Samples were monitored every 7 days for a total of 2 months, for the presence and development of eggs. With increasing temperature, the number of eggs undergoing development increased (P<0.01); the number of deformed eggs decreased, the number of infective eggs increased (P<0.01), and egg maturation was accelerated. A decrease in the survival of infective eggs occurred at 34°C. An increase in humidity produced a rise in the number of developed eggs at all three temperatures (P<0.01). This study suggests that elevated temperatures accelerated the development as well as the degradation of eggs of T. canis, whereas the range in humidity was directly correlated with egg development.

Type
Research Article
Information
Journal of Helminthology , Volume 79 , Issue 4 , December 2005 , pp. 327 - 331
Copyright
Copyright © Cambridge University Press 2005

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