Isolation, identification and virulence gene characterization of Aeromonas dhakensis isolated from sea lion (Zalophus californianus).
Lett Appl Microbiol
; 74(6): 932-940, 2022 Jun.
Article
in En
| MEDLINE
| ID: mdl-35239198
ABSTRACT
Species of Aeromonas are ubiquitous pathogens of fish and aquatic animals and can infect humans and other animals through the food chain. However, there are few reports of marine mammalian infections. In 2020, a sea lion (Zalophus californianus) died acutely at an aquarium in Harbin, Heilongjiang Province, China. In order to explore the cause of death, we dissected the animal and observed pathological changes. Ogans were aseptically collected and used for bacterial isolation and culture. This revealed that the sea lion had died of sepsis caused by a bacterial infection. Isolated bacteria were investigated by morphology, biochemical phenotype and molecular identification, and this determined the pathogen as A. dhakensis. The isolate contained six virulence genes, hlyA, aerA, act, lafA, ela, fla, and was susceptible to most antibiotics. This is the first report of A. dhakensis associated with septicaemia in pinnipeds and a description of its virulence and resistance profiles. Its presence in aquatic environments poses a potential threat to marine mammals.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Gram-Negative Bacterial Infections
/
Sepsis
/
Aeromonas
/
Sea Lions
Type of study:
Diagnostic_studies
Limits:
Animals
Language:
En
Journal:
Lett Appl Microbiol
Year:
2022
Document type:
Article