RESUMEN
Filamentous black yeasts from the genus Exophiala are ubiquitous, opportunistic pathogens causing both superficial and systemic mycoses in warm- and cold-blooded animals. Infections by black yeasts have been reported relatively frequently in a variety of captive and farmed freshwater and marine fishes. In November 2012, moribund and recently dead, farm-raised Atlantic Halibut Hippoglossus hippoglossus were necropsied to determine the cause of death. Histopathology revealed that three of seven fish were affected by a combination of an ascending trans-ductual granulomatous mycotic nephritis, necrotizing histiocytic encephalitis, and in one fish the addition of a fibrogranulomatous submucosal branchitis. Microbial cultures of kidney using selective mycotic media revealed pure growth of a black-pigmenting septated agent. Application of molecular and phenotypic taxonomy methodologies determined that all three isolates were genetically consistent with Exophiala angulospora. This is the first report of E. angulospora as the causal agent of systemic mycosis in Atlantic Halibut.
Asunto(s)
Exophiala/patogenicidad , Enfermedades de los Peces/microbiología , Lenguado , Feohifomicosis/veterinaria , Animales , Acuicultura , Exophiala/genética , Feohifomicosis/microbiología , FilogeniaRESUMEN
Streptococcus suis was isolated postmortem from 2 lambs with a history of lameness. Identity of S. suis was confirmed by species-specific polymerase chain reaction (PCR) and by 16S rRNA gene sequencing. One isolate was untypable by serotyping and non-encapsulated, while the other isolate was serotype 33. The lambs had come from the same farm, and there was no evidence of contact between the lambs and pigs. Although the natural niche for S. suis is considered to be the pig, a wide range of host species may be affected by this pathogen.
Isolement deStreptococcus suischez 2 agneaux avec une anamnèse de boiterie.Streptococcus suis a été isolé post-mortem chez 2 agneaux avec une anamnèse de boiterie. L'identité de S. suis a été confirmée par une amplification en chaîne par la polymérase (ACP) et par le séquençage génétique de l'ARNr 16S. Un isolat n'a pas pu être typé par sérotypage et était non encapsulé, tandis que l'autre isolat était de sérotype 33. Les agneaux provenaient de la même ferme et il n'y avait aucune preuve de contact entre les agneaux et les porcs. Même si le créneau naturel de S. suis est considéré comme étant le porc, un vaste éventail d'espèces hôtes peuvent être affectées par cet agent pathogène.(Traduit par Isabelle Vallières).
