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Systemic Erysipelothrix rhusiopathiae in seven free-ranging delphinids stranded in England and Wales. | LitMetric

AI Article Synopsis

  • A review of microbiology records from 1127 stranded cetaceans in England and Wales (1990-2019) revealed a low prevalence (0.62%) of the zoonotic pathogen Erysipelothrix rhusiopathiae.
  • The bacteria were found in three species: bottlenose dolphins, harbor porpoises, and short-beaked common dolphins, causing septicemia and various organ issues during necropsies.
  • Antibiotic susceptibility tests indicated that while there was some resistance to amikacin and trimethoprim sulfonamide, penicillins and several other antibiotics remained effective in treating infections caused by E. rhusiopathiae.

Article Abstract

Microbiology records for 1127 cetaceans stranded on English and Welsh beaches and examined at the Institute of Zoology between 1990 and 2019 were reviewed to identify cases of Erysipelothrix rhusiopathiae, an uncommon but potentially fatal zoonotic pathogen. Once cases were identified, prevalence was calculated, corresponding postmortem reports were reviewed, common gross and histopathological findings were identified, and antibiotic susceptibilities were determined. Overall prevalence for E. rhusiopathiae was 0.62% (7/1127; 95% CI: 0.30-1.28%). It was isolated from 3 bottlenose dolphins Tursiops truncatus, 3 harbor porpoises Phocoena phocoena, and 1 short-beaked common dolphin Delphinus delphis, with a prevalence of 21.4% (3/14; 95% CI: 7.6-47.9%), 0.39% (3/779; 95% CI: 0.13-1.13%), and 0.47% (1/212; 95% CI: 0.08-2.62%) for each species, respectively. E. rhusiopathiae resulted in septicemia in all cases from which it was isolated. Gross necropsy findings included pulmonary edema (5/7), hemorrhage (5/7) and/or congestion of various organs (4/7), and serosanguineous effusion (3/7; pericardial: 3/7, pleural: 2/6, abdominal: 2/6). Congestion (5/5), bacterial emboli (4/5), and hemorrhage (4/5) were commonly observed on histopathology, and acute renal tubular injury (2/5) and pulmonary edema (2/5) were occasionally observed. Routine bacterial cultures were vital in identifying E. rhusiopathiae, since gross lesions were often subtle and nonspecific. The liver, kidney, and brain were key organs from which E. rhusiopathiae was consistently isolated. Antibiotic resistance was uncommon and was only observed for amikacin and trimethoprim sulfonamide. Penicillins were consistently effective, along with fluoroquinolones, macrolides, clindamycin, cephalexin, and oxytetracycline.

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Source
http://dx.doi.org/10.3354/dao03609DOI Listing

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