Trueperella pyogenes

Trueperella pyogenes is a species of nonmotile, facultatively anaerobic, Gram-positive bacteria. The cells typically measure 0.5 by 2.0 μm. They appear as pleomorphic or coccoid rods. They tend to be grouped singly or in short chains but are sometimes grouped into V-shaped pairs.^[3]

Trueperella pyogenes
Scientific classification
Domain:	Bacteria
Kingdom:	Bacillati
Phylum:	Actinomycetota
Class:	Actinomycetia
Order:	Actinomycetales
Family:	Actinomycetaceae
Genus:	Trueperella
Species:	T. pyogenes
Binomial name
Trueperella pyogenes (Glage 1903) Yassin et al. 2011[1]
Type strain
ATCC 19411 C-100[2] CCUG 13230 CIP 103129 DSM 20630 LMG 16162 NCTC 5224
Synonyms[2][3]
Actinomyces pyogenes (Glage 1903) Collins and Jones 1983 Arcanobacterium pyogenes (Glage 1903) Pascual Ramos et al. 1997[4] Actinomyces pyogenes (Glage 1903) Reddy et al. 1982 "Bacillus pyogenes" Glage 1903 Corynebacterium pyogenes (Glage 1903) Eberson 1918 (Approved Lists 1980)

T. pyogenes is found in the urogenital, gastrointestinal, and upper respiratory tracts of cattle, goats, horses, musk deer, pigs, and sheep, in which it may cause abscesses, mastitis, metritis, and pneumonia.^[3][5] Although it can thrive in either anaerobic or aerobic environments, it is ideally suited to one with high (about 7%) levels of carbon dioxide.^[5]

When the genus Arcanobacterium was split into two (Arcanobacterium and Trueperella gen. nov.),^[1] the new genus name was chosen in honor of German microbiologist Hans G. Trüper [de].^[3] The specific name pyogenes, used in various bacterial genera, was derived from the Greek puon or Latin pyum and suffix -genes, yielding pyogenes, meaning "pus-producing".^[2]

Although it can infect a wide variety of tissues, Trueperella pyogenes is the most common cause of "summer mastitis" in cattle and pyometra in dogs ^{[citation needed]}.