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Toxocara canis ova and Cystoisospora oocysts
Toxocara canis ova and Cystoisospora oocysts

Toxocara canis ova (larger structures) and Cystoisospora oocysts (smaller structures).

Courtesy of Dr. Andrew Peregrine and Ontario Veterinary College.

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Roundworms in Small Animals

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Merck & Co., Inc., Kenilworth, NJ, USA is a global healthcare leader working to help the world be well. From developing new therapies that treat and prevent disease to helping people in need, we are committed to improving health and well-being 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 Manual outside of North America.

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