Common Gastrointestinal Parasites of Cattle - Digestive System - Merck Veterinary Manual

Merck & Co., Inc., Rahway, NJ, USA (known as MSD outside of the US and Canada) is dedicated to using leading-edge science to save and improve lives around the world.  The Veterinary Manual was first published in 1955 as a service to the community.  The legacy of this great resource continues in the online and mobile app versions today.
Strongyloides eggs can be easily distinguished from the eggs of trichostrongyles that infect ruminants because Strongyloides eggs are slightly smaller and contain a larva when passed in the feces. Trichostrongyle eggs will not be larvated in a fresh fecal sample, but they may larvate in the sample if stored incorrectly. This video of Strongyloides shows motile larvae to the left of a typical trichostrongyle egg. A large air bubble is also present to the left of the Strongyloides egg.

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