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Infectivity of Echinococcus granulosus protoscolices under different conditions of temperature and humidity

Published online by Cambridge University Press:  01 December 2008

A.I. Diker ,
R. Tinar  and
B. Senlik
A.I. Diker*
Affiliation:
Parasitology Department, Uludag University, Faculty of Veterinary Medicine, Gorukle Campus, 16059Bursa, Turkey
R. Tinar
Affiliation:
Parasitology Department, Uludag University, Faculty of Veterinary Medicine, Gorukle Campus, 16059Bursa, Turkey
B. Senlik
Affiliation:
Parasitology Department, Uludag University, Faculty of Veterinary Medicine, Gorukle Campus, 16059Bursa, Turkey
*
*Fax: +90 224 2941202 E-mail: ihsandiker@uludag.edu.tr
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Abstract

The aim of this study was to examine the effect of different temperatures and humidities on the infectivity of Echinococcus granulosus protoscolices. Eighteen dogs (6 groups, n = 3 each) were fed with offal mince harbouring approximately 20,000 protoscolices of E. granulosus of different viabilities. Dogs were infected with E. granulosus protoscolices of: (1) 5% viability at − 10°C and 50% relative humidity (RH); (2) 30% viability at 0°C and 60% RH; (3) 20% viability at +10°C and 65% RH; (4) 15% viability at +30°C and 75% RH; (5) 11% viability at +40°C and 80% RH; (6) 68% viability (control group). Dogs in each group were necropsied at 29–49 days post-infection. Mean intensities of E. granulosus recovered from dogs were 256.7 ± 60.3 in the second group; 32.7 ± 7.1 in the third group; 40.3 ± 15.5 in the fourth group and 1533 ± 513 in the control group. However, no parasites were recovered from the first and fifth groups. Results obtained in the present study show that larval stages could be infective for 1 to 4 weeks during spring, autumn or winter months when maximal temperatures are approximately 0–10°C. In conclusion, cold-storage depots in slaughterhouses and abattoirs where sheep carcasses might be discarded should be kept at − 20°C for 2–3 days, dogs should be properly controlled and adequate control programmes must be established in areas where the disease is endemic.

Type
Research Papers
Information
Journal of Helminthology , Volume 82 , Issue 4 , December 2008 , pp. 297 - 300
Copyright
Copyright © Cambridge University Press 2008

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