Trueperella spp

From Cow
Trueperella on agar, seen under light microscopy

Trueperella pyogenes (formerly Arcanobacterium pyogenes)[1] are a genus of gram positive Actinobacteria, a group of bacteria which have been implicated in a range of infections in cattle including mastitis and puerperal metritis.

T. pyogenes is considered the causative agent of acute suppurative mastitis called summer mastitis[2].

T. pyogenes produces a variety of known and putative virulence factors that include pyolysin and factors promoting adhesion to host cells.

Resistance of this bacteria to tetracycline and macrolides has been reported.

Systemic infections have been reported in other ruminants such as sheep, but not in cattle.

These bacteria are normally soil dwelling and infect cattle through commensal activity or via trauma.


  1. Reddy, CA et al (1982) Transfer of Corynebacterium pyogenes (Glage) Eberson to the genus Actinomyces as Actinomyces pyogenes (Glage) comb. nov. Int J Syst Bacteriol 32:419-429
  2. Zastempowska E & Lassa H (2012) Genotypic characterization and evaluation of an antibiotic resistance of Trueperella pyogenes (Arcanobacterium pyogenes) isolated from milk of dairy cows with clinical mastitis. Vet Microbiol Jul 20