Detection of Salmonella from animal sources in South Africa between 2007 and 2014.

Awoke K. Gelaw,Palesa Nthaba,Itumeleng Matle

doi:10.4102/jsava.v89i0.1643

Awoke K. Gelaw, Palesa Nthaba + Show 1 more

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https://doi.org/10.4102/jsava.v89i0.1643

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Abstract

Retrospective laboratory-based surveillance was conducted on Salmonella serotypes isolated from various animal species from 2007 to 2014 at the Agricultural Research Council, Onderstepoort Veterinary Research Institute, South Africa. During the surveillance period, 1229 salmonellae isolations were recorded. Around 108 different serotypes were recovered from nine different food and non-food animal host species. The three most common serotypes were Salmonella enterica subspecies enterica serotype Heidelberg (n = 200), Salmonella enterica subspecies enterica serotype Enteritidis (n = 170) and Salmonella enterica subspecies enterica serotype Typhimurium (n = 146). These were followed by Salmonella enterica subspecies enterica serotype Anatum (n = 62) and Salmonella enterica subspecies enterica serotype Infantis (n = 57). Salmonella enterica subspecies enterica serotype Schwarzengrund and Salmonella enterica subspecies enterica serotype Muenchen were recovered in 50 and 48 cases, respectively. Of the total number of isolations recorded during the period under review, 871 (70.8%) occurred in poultry and other birds, 162 (13.2%) in horses, 116 (9.4%) in cattle, 26 (2.1%) in sheep and goats, 22 (1.8%) in rhinoceroses, 16 (1.3%) in pigs, 8 (0.6%) in crocodiles, 6 (0.5%) in cats and 6 (0.5%) in leopards. Food animals accounted for 83.5% of the total isolations, with cattle and poultry representing approximately 72.7%. Forty-two (3.4 %) isolates were found from non-food animals that include rhinoceroses (n = 22), crocodiles (n = 8), leopards (n = 6) and cats (n = 6). Salmonella Heidelberg was the most frequently isolated serotype, whereas S. Typhimurium had the widest zoological distribution. Clinical laboratory isolation of different Salmonella serotypes from various hosts may aid in recognising the threat to livestock, public and environmental health. Moreover, it may also highlight the potential zoonotic and food safety risk implications of the detected Salmonella serotypes.

Highlights

IntroductionSalmonella infection (salmonellosis) is a common bacterial disease that mainly affects the intestinal tract of vertebrate and invertebrate hosts
Salmonella infection is a common bacterial disease that mainly affects the intestinal tract of vertebrate and invertebrate hosts
Of the total of 1229 isolates with 108 serotypes recorded during the period under review, 871 (70.8%) occurred in poultry and other birds, 162 (13.2%) in horses, 116 (9.4%) in cattle, 26 (2.1%) in sheep and goats, 22 (1.8%) in rhinoceroses, (1.3%) in pigs, 8 (0.6%) in crocodiles, 6 (0.5%) in cats and

Summary

Introduction

Salmonella infection (salmonellosis) is a common bacterial disease that mainly affects the intestinal tract of vertebrate and invertebrate hosts. Salmonellosis remains a persistent threat to human and animal health and welfare in spite of the advances made in its detection, typing and control (Peek et al.2004; Refsum et al 2002). Salmonella enterica subspecies are further classified into more than 2500 serovars or serotypes and include pathogens of great medical and veterinary importance (EFSA 2008; Mead et al 1999; Morgan et al 2004). These serovars differ greatly in their host range and degree of host adaptation. In 2005, Salmonella enterica gained official approval as the type species of the genus Salmonella (Coburn et al 2007)

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