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Trichostrongylus axei (pigs)



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Trichostrongylus axei
Stomach hair worm

General Description:
The adult worm is tiny (0.5 cm) and hairlike.

Life Cycle:

The direct life cycle of Trichostrongylus is typical of nematodes, as described in the Overview. Larvae develop to infectivity on pasture in 4 to 6 days with optimal humidity and warmth. The prepatent period is 3 weeks.

The adult occurs in the lumen of stomach glands and in the small intestine.

Geographical Distribution:

Not common.

Minor. The stomach hair worm may contribute to mixed infections involving several gastrointestinal worm species.

Effect on Host:
Trichostrongylus is usually part of a mixed infection, so its results are additive.

Diagnostic Information:
The small, "strongyle-type" egg is not identifiable by species. Fecal cultures can be made and third stage larvae identified. Approximately 80 µm long.

"Strongyle egg"

Broad ellipse
Barrel-shaped side walls
Blastomeres present, number vary
It is not often possible to identify strongyle eggs to genus level as the eggs of most strongylid and trichostrongylid species are similar in appearance and overlapping in size.
If identification is necessary the faecal sample must be cultured to provide L3 larvae for further examination !!!

Dry conditions are unfavorable for larval development. Regular treatments when fecal examination is positive for "strongyle-type" eggs will keep worm burdens down and lower pasture contamination.


Trichostrongylus: egg
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Trichostrongylus: female posterior end
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Trichostrongylus: female uterus
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