Abstract
Techniques to preserve the infective third-stage larvae (L3) of gastrointestinal nematodes are of considerable interest to preserve rare species and to maintain a stable source for routine experimental infections. This study compares the relative pros and cons of the two most common techniques, cryopreservation and refrigeration by comparing how they influence consequent infection outcome parameters in terms of life-history traits and fitness as a function of time using the gastrointestinal nematode of sheep Haemonchus contortus as a study species. Establishment capacity was found to be significantly reduced in cryopreserved stocks of L3 compared to refrigerated stocks, but this was followed by significant increases in their fecundity. Refrigeration did not affect L3 stocks consequent fitness by 16 months (the maximum examined) although they did incur a significant reduction in establishment, followed once again by an augmentation in fecundity. The study highlights potential areas for bias in comparing studies using L3 larvae maintained for different periods of time under different techniques.
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Acknowledgments
C. Chylinski is a grateful recipient of Marie Curie ITN funding “NematodeSystemHealth”. Thanks to T. Chaumeil and team for their care of the sheep.
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Chylinski, C., Cortet, J., Sallé, G. et al. Storage of gastrointestinal nematode infective larvae for species preservation and experimental infections. Parasitol Res 114, 715–720 (2015). https://doi.org/10.1007/s00436-014-4238-5
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DOI: https://doi.org/10.1007/s00436-014-4238-5