Abstract
Arcanobacterium (Actinomyces) pyogenes is an inhabitant of the mucous membranes of the respiratory and genital tracts of a number of domestic animal species. However, following a precipitating physical or microbial insult, A. pyogenes can become an opportunistic pathogen, associated with suppurative infections. The isolation of A. pyogenes from the bovine ruminal wall indicated that this organism may also inhabit the gastrointestinal tract of, at least, cattle. To determine whether A. pyogenes was also present on the gastric mucosa of a monogastric animal, porcine stomachs were cultured for the presence of this organism. Of 13 stomachs sampled, A. pyogenes was isolated from 5 (39%). The identity of the organism was confirmed by PCR with primers specific to the plo gene, which encodes the A. pyogenes haemolytic exotoxin pyolysin. In addition, an isolate from each positive stomach was subjected to 16S rRNA gene sequencing and the identification as A. pyogenes was confirmed. These data indicate that A. pyogenes may be resident on the gastric mucosa of pigs.
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