Pseudo-membranes on internal organs associated with Rhodococcus qingshengii infection in Atlantic salmon (Salmo salar).
This paper describes a pathological condition in intensive reared Atlantic salmon (Salmo salar), restricted to the appearance of pseudo-membranes covering internal organs (i.e. spleen, liver, heart and others) associated with the presence of large numbers of a Gram-positive bacteria. Isolate 79043-3, obtained as pure culture from affected fish, was subjected to a polyphasic taxonomic study in order to determine its exact taxonomic position, as well as to experimental challenges leading to determine its pathogenic potential for cultured fish. Based on this characterization, we report the first isolation of Rhodococcus qingshengii, from a farmed population of Atlantic salmon in Chile. Virulence studies demonstrated that the isolate fulfilled the Koch's postulates, suggesting that this bacterial species could be considered as an opportunistic pathogen for Atlantic salmon.
Avendaño-Herrera
Rubén
R
Universidad Andrés Bello, Facultad de Ciencias Básicas, Departamento de Ciencias Básica, Viña del Mar, Chile.
Balboa
Sabela
S
Doce
Alejandra
A
Ilardi
Pedro
P
Lovera
Pablo
P
Toranzo
Alicia E
AE
Romalde
Jesús L
JL
D000193:Actinomycetales Infections / Q000382:microbiology / Q000473:pathology / Q000662:veterinary*; D000818:Animals; D002677:Chile; D005393:Fish Diseases / Q000382:microbiology / Q000473:pathology*; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012240:Rhodococcus / Q000145:classification / Q000235:genetics / Q000472:pathogenicity / Q000502:physiology*; D020317:Salmo salar
D012336:RNA, Ribosomal, 16S