Merck Manual

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Differentiating Haemonchus contortus from other trichostrongyles
differentiating-haemonchus-contortus-from-other-trichostrongyles-vanhoy-sized
Differentiating Haemonchus contortus from other trichostrongyles

    To differentiate Haemonchus contortus eggs from other similar-looking trichostrongyle eggs, a specialized fluorescein-labeled peanut agglutinin stain can be applied. H contortus eggs take up the stain and fluoresce under UV light, as this photomicrograph shows; other trichostrongyle eggs (yellow arrowhead) do not fluoresce.

Courtesy of Dr. Antoinette Marsh.