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Rumen Microbes – Trueperella Pyogenes

Trueperella pyogenes (formerly known as Actinomyces pyogenes and Arcanobacterium pyogenes) is a rod-shaped, Gram-positive, facultative anaerobe. T. pyogenes is found in the rumen, but is also identified acting as a pathogen in the liver and reproductive tract.

Click the image hotspots to learn more about this featured microbe.

This interactive image was created by: Taylor Ault Seay

Image courtesy of AgNetWest.

two cattle in a field
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microscopic image of Gram stained bacteria

T. pyogenes has been found to act synergistically with Fusobacterium necrophorum in causing liver abscesses in cattle. Image from Bank et al. 2010.

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microscopic image of Gram stained bacteria

As a facultative anaerobe, T. pyogenes are more commonly found on the rumen wall of healthy cattle than in the rumen content due to the low oxygen concentration diffusing from the ruminal wall blood vessels. Image from Microbe Canvas.

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several cattle eating together from a bunk

​Diets low in forage content that lead to a more acidic rumen environment can cause damage to the ruminal wall, allowing T. pyogenes to escape the rumen and become pathogenic in other organs. Image from North Dakota State University.

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cattle in a field

T. pyogenes is often isolated from postpartum uterine infections, such as endometritis or metritis, which are associated with reduced fertility. Image from Alabama Cooperative Extension System.

Follow this link to view all of the interactive presentations for the Rumen Microbes series.