The viability and infectivity ofToxocara canis infective larvae after a prolonged period of storage at different temperatures

Al-Tae, Abdul-Rahman Aziz; Al-Bashir, Nada M.

doi:10.1007/bf01096140

Cited by 1 publication

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“…Others studied the impact of temperature on egg and larval viability and infectivity (Al-Tae and Al-Bashir 1988;O'Lorcain 1995b). Different conclusions were obtained from these studies due to the different methods used to develop the eggs.…”

Section: Introductionmentioning

confidence: 95%

Temperature and the development and survival of infective Toxocara canis larvae

et al. 2011

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The influence of temperature on the development and survival of Toxocara canis larvae was investigated under laboratory conditions, in water at 15, 20, 25, 30 and 35°C and at room temperature 22°C ± 1°C. T. canis eggs were able to develop to the larvated stage at all the tested temperatures. Development rate increased with temperature. Linear regression of development rate against temperature predicted a lower development threshold of 11.8°C. Eggs survived cooling to 1 and -2°C for 6 weeks, and could develop to the infective, larvated stage when transferred to higher temperatures, but their development rates were then retarded compared with non-chilled eggs. Larvated eggs remained viable after 7 weeks of incubation across the tested temperature range, with the highest percentage viability (47%) obtained at 25°C. Development of eggs to the infective larval stage required, on average, 121 degree days between 20°C and 30°C. Results provide a basis for predicting variation in the infectivity of eggs in the environment over time in different climates.

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Section: Introductionmentioning

confidence: 95%