Seasonal availability of Fasciola hepatica metacercariae in a temperate Mediterranean area (Madrid, Spain)

Zentralblatt für Veterinärmedizin. Reihe B. Journal of veterinary medicine. Series B
M Luzón-PeñaM Gómez-Bautista

Abstract

In this experiment, conducted over a 3-year period (1988-1990), the seasonal availability of Fasciola hepatica metacercariae in a temperate Mediterranean area (Madrid, central Spain) was analysed according to the rhythms of snail infection, the periods of cercarial emission, and the resistance of metacercariae. In this area, snails could be infected from late April to early November. Cercarial emission by spring infection started at the beginning of summer and terminated 3-4 weeks later. Mid-summer temperatures led to the extinction of shedding populations and of the metacercariae emitted by them, but were well tolerated by the snails with undeveloped infections. No aestivation was observed and summer infection led to a progressive shedding wave from August to late December, when it was interrupted. These populations became extinguished in the colder winter of 1988, but overwintered in the mild and belated winter of 1989. Only the snails infected from late summer onwards resumed activity and shed cercariae in spring, from the second half of March to late June. Risk of infection for grazing animals during winter will depend on survival of metacercariae. With a mean mortality of 23% during December and January, and of 38% during ...Continue Reading

References

Dec 1, 1992·The Veterinary Quarterly·C P GaasenbeekW A de Leeuw
Jul 1, 1992·Zentralblatt für Veterinärmedizin. Reihe B. Journal of veterinary medicine. Series B·M Luzón-PeñaM Gómez-Bautista
Aug 1, 1990·International Journal for Parasitology·W M Boyce, C H Courtney
Dec 1, 1969·Australian Veterinary Journal·J C BorayJ C Andrews
Aug 1, 1970·The British Veterinary Journal·J G Ross

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Citations

Jan 30, 2007·The Veterinary Journal·Monika BöhmM R Hutchings

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