Yokenella regensburgei, a novel pathogen in farmed American alligators

Author:

Balamayooran Gayathriy1,Cooper Clark2,Paul Narayan C.1,Ferro Pamela J.1,Rice Laura1,Gomez Gabriel1,Díaz-Delgado Josué1ORCID

Affiliation:

1. Texas A&M Veterinary Medical Diagnostic Laboratory, College Station, TX

2. Cooper Veterinary Hospital, West Monroe, LA

Abstract

Increased acute mortality of farmed American alligators ( Alligator mississippiensis) was observed in various pens from 2 different farms in Louisiana over 2 years (2019-2021). A total of 14 alligators from multiple events of increased mortality were subjected to postmortem investigations. Except for one alligator with acute neurologic signs, no premonitory signs were observed. All animals had pneumonia (14/14), coelomitis (14/14), and intravascular short Gram-negative bacilli (14/14). Myocarditis (13/14) was common. Yokenella regensburgei was isolated from all alligators tested (13/13). These data suggest the respiratory tract may be a primary target system and could be involved in transmission, either through exhaled bacteria or through swallowing of contaminated respiratory fluids with passage through the feces. Available sensitivity data for Y. regensburgei in this study indicates in vitro sensitivity to aminoglycosides, fluoroquinolones, chloramphenicol, and trimethoprim/sulphamethoxazole antibiotics. Yokenella regensburgei should be included in the differential diagnosis of septicemia and acute death in alligators.

Publisher

SAGE Publications

Subject

General Veterinary

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