Pubblicazione scientifica

Edwardsiella tarda outbreak affecting fishes and aquatic birds in Brazil

FILONE TECNOLOGICO	TEMA
trasformazione e commercializzazione

RIASSUNTO

Abstract

Background:Edwardsiella tarda infections are frequent causes of severe outbreaks in the fish farming industry besides representing possible zoonotic risks. However, naturally occurring outbreaks that affect various species besides fishes are seldom described.

Aim: To report an outbreak of acute mortality caused by E. tarda affecting multiple species that inhabited a natural pond in the state of São Paulo, Brazil.

Materials and methods: Three adult tilapias, three Mallard ducks and one Snow egret were necropsied and subjected to further microbiological tests. Gross and microscopic lesions were documented. The antibiotic susceptibility and phylogenetic similarities among fish and avian strains were also determined. The E. tarda species was confirmed through MALDI-TOF, partial sodB sequencing and phylogenetic analysis.

Results: Macroscopical findings between the three species included intestinal dilatation, mucosal hyperaemia and mucous to liquid contents. Common histopathology findings included acute enteritis, increased number of intraepithelial lymphocytes with bacteria adhered to the intestinal epithelium and lymphoid depletion in the spleen. E. tarda was isolated from several organs from all affected species. The phylogeny employing amplified fragment length polymorphism (AFLP) of eleven strains revealed high similarity (>90%) among the isolates regardless of the affected species or sampled organs. Ten isolates of E. tarda showed susceptibility to all tested antibiotics.

Conclusions:E. tarda was identified as the cause of death of the species examined. Further studies would be necessary to determine the virulence of these strains and the possible risks regarding public health.

DATA

Data di pubblicazione: 22/01/2019

AUTORI

MINIERO DAVIES YAME
XAVIER DE OLIVEIRA MARIA GABRIELA
PAULO VIEIRA CUNHA MARCOS
SOARES FRANCO LETICIA
PULECIO SANTOS SANDY LORENA
ZANOLLI MORENO LUISA
TULIO DE MOURA GOMES VASCO
ZANOLLI SATO MARIA INES
SCHIAVO NARDI MARCELLO
MICKE MORENO ANDREA
BECKER SAIDENBERG ANDRE
ROSE MARQUES DE SA LILIAN
KNOBL TEREZINHA

RIVISTA

The Veterinary Quarterly, 38(1), 99-105

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