Isolation ofArcanobacterium(Actinomyces)Pyogenesfrom Cases of Feline Otitis Externa and Canine Cystitis

Abstract

159Brief Communications of clinical illness and a small focus of infection might only be detectable by postmortem examination.Inflammatory changes within the fetal lung were diffuse, without the abscess formation and necrosis typical of subacute to chronic postnatal R. equi pneumonia. The disseminated nature of the pneumonia was similar to that in a previous report, in which the lesions were suggested to be acute. 2 The presence of R. equi in airways, pulmonary alveolar spaces, and stomach content of both fetuses is consistent with aspiration and ingestion, respectively, of infected amnionic fluid. Proximity of bacteria to allantoic surfaces within the placenta most likely allowed access to the allantoic and amnionic cavities. Presentation of the fetus within intact placental membranes indicated sudden separation of the chorioallantois from the endometrium due to fetal hypoxia; the cause in this case was most likely the severe pulmonary disease.The present case and one previous report indicate an association between rhodococcal infection, fetal pneumonia, and abortion in horses. Surveys of equine placentitis, equine abortion, and stillbirth reported from the Department of Veterinary Sciences, Livestock Disease Diagnostic Center, University of Kentucky, Lexington, Kentucky, for the 1988 and 1989 foaling seasons did not report R. equi as a cause. 4,5 One other case of rhodococcal abortion and fetal pneumonia was diagnosed in this laboratory in 1998; Gram-positive coccobacilli were observed histologically in the amnion but not the chorioallantois. The high prevalence of virulent organisms in the environment of many farms and in fecal material of mares on those farms 7 does not appear to be associated with ascending uterine infections, and isolation of this organism from cervical culture is uncommon. 1 To the authors' knowledge, this is the first description of placentitis due to R. equi infection in a horse.Acknowledgement. This work is published as College of Agriculture, University of Kentucky publication 99-14-144. Abstract. Arcanobacterium pyogenes is a normal inhabitant of the mucous membranes of domestic animals, such as cattle, sheep, swine, and goats. It is also an opportunistic pathogen in these animals, where it causes a variety of purulent infections involving the skin, joints, and visceral organs. Two recent cases of isolation of A. pyogenes from companion animals are reported. In the first case, a cat presented with a chronic otitis externa, from which A. pyogenes was isolated in pure culture. The second case involved a dog with a urinary tract infection, where A. pyogenes was isolated from urine as the predominant bacterial species. In both cases, the A. pyogenes isolates were presumptively identified by macrobiochemical tests, and then their identities were confirmed by polymerase chain reaction analysis and 16S rRNA gene sequencing.Arcanobacterium pyogenes, recently reclassified from the genus Actinomyces,

Trueperella pyogenesmultispecies infections in domestic animals: a retrospective study of 144 cases (2002 to 2012)

“…Unlike in livestock, T. pyogenes infections are infrequently described in dogs and cats, probably because this pathogen is not considered to be a normal inhabitant of the mucous membranes of companion animals (Billington et al 2002;Greene 2012). In this study, only one case of pneumonia and another of encephalitis were observed in two dogs, reinforcing that T. pyogenes is an uncommon clinical pathogen among companion animals.…”

Isolation of Arcanobacterium pyogenes from Samples of Sheep and Cattle and Identification by Polimerase Chain Reaction

“…İnku basyon sonrası küçük, iğne ucu büyüklüğünde, β-he moliz yapan, gram pozitif, gram değişken veya pleo morfik görünümlü koloniler şüpheli kabul edildi. Rutin biyokimyasal testler; katalaz ve oksidaz negatif, nitrat redüksiyon, eskülin, jelatin hidroliz, üreaz üretimi, glikoz, maltoz, mannitol, sukroz ve ksiloz fermentasyonu, casein agarda sıvılaşma görünümü, oksidasyon-fermantasyon yönünden incelendi 12,15,17, 21 .…”

Arcanobacterium haemolyticum associated with pyothorax: case report

“…But there are few reports of animal infection caused by this organism [5,6]. The role of A. haemolyticum as a zoonotic disease and its differentiation from the closely related animal pathogen Arcanobacterium pyogenes needs to be defined [7-10]. A. pyogenes is one of the agents of bovine mastitis and is also known to cause pyogenic infections in human [11,12].…”