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Merck Manual
Veterinary Manual
The trusted provider of veterinary information since 1955

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VETERINARY PET
Nematodirus eggs
nematodirus-eggs-vanhoy-sized
Nematodirus eggs

    The eggs of ruminant-infecting Nematodirus spp (arrowhead) are distinct from those of other trichostrongyles (arrow) because of their large size and the large number of distinctive, large cells (2–8) within the egg.

Courtesy of Dr. Grace VanHoy.

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Common Gastrointestinal Parasites of Cattle

Merck & Co., Inc., Rahway, NJ, USA (known as MSD outside of the US and Canada) is dedicated to using the power of leading-edge science to save and improve lives around the world.  The Merck Veterinary Manual was first published in 1955 as a service to the community.  The legacy of this great resource continues as the Merck Veterinary Manual in the US and Canada and the MSD Vet Manual outside of North America.

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