Retrospective study on the incidence of Salmonella isolations in animals in South Africa, 1996 to 2006

Abstract

A retrospective study that involves the analysis of laboratory diagnostic data collected during the period 1996-2006 was conducted. A total of 3417 Salmonella isolations involving 183 different serotypes was recorded from 1999-2006, inclusive, at the Onderstepoort Veterinary Institute, Agricultural Research Council, South Africa. The most common serotypes were Salmonella enterica subspecies enterica serovar Typhimurium (917 incidents), Salmonella enterica subspecies enterica serovar Dublin (248 incidents), Salmonella enterica subspecies enterica serovar Enteritidis (232 incidents), Salmonella enterica subspecies enterica serovar Muenchen (164 incidents), Salmonella enterica subspecies enterica serovar Heidelberg (118 incidents) and Salmonella enterica subspecies enterica serovar Chester (113 incidents). The number of recorded Salmonella isolations over the period 1996 to 2006 varies considerably from year to year. The peak of 693 isolations was recorded in 1997, and the lowest, 108 incidents, in 2001. Of the total incidents recorded during the period of survey, 2410 (70.5 %) occurred in poultry and other birds, 641 (18.75 %) occurred in cattle, 255 (7.46) in pigs and 111 (3.24 %) in sheep. Despite the large number of serotypes isolated (183), 52% of incidents were due to only 6 serotypes in decreasing order of prevalence : S. Typhimurium, S. Dublin, S. Enteritidis, S. Muenchen, S. Heidelberg and S. Chester. Serovar Typhimurium was the most common serotype and was detected in all animal species sampled, with, 65 % (598) of the incidents occurring in poultry and 20 % (187) occurring in cattle. Of the total of 248 incidents of S. Dublin serotype, 95.6 % (237) of incidents occurred in cattle and of the 232 isolates of S. Enteritidis, 223 (96 %) originated from poultry. Serovar Choleraesuis was identified in 16 isolates from pigs. The following 4 serotypes were each recorded in more than 50 incidents : S. Hadar (102), S. Schwarzengrund (99), S. Mbandaka (94) and S. Sandiego (73). The trends of annual incidence of Salmonella infection in cattle, sheep, pigs, poultry and other birds during the 11-year period and the distribution of the main serotypes in individual species of animals from 1996-2006 are discussed

Multiple-locus variable-number tandem repeat analysis ofSalmonella entericasubsp.entericaserovar Dublin

“…; Kidanemariam et al . ). Transmission to humans may arise from contact with infected animals or more commonly, through consumption of contaminated products (Maguire et al .…”

Antibiotic resistance profiles of Escherichia coli O26, O145, and O157:H7 isolated from swine in the Eastern Cape Province, South Africa

“…Coupled with the abuse of antibiotics by humans, their use in livestock production has been shown to play a significant role in the development of antibiotic resistance worldwide [8-In South Africa, studies on antibiotic resistance in isolates from food animals so far have been on E. coli O157 recovered from poultry, milk products and pork in northwest province [11,12], Salmonella from farm animals [13,14], Enterococcus from pigs [15] and E. coli O157 from cattle farms [16]. Due to the global threat to human health arising from antibiotic resistance, the need for constant surveillance studies on antibiotic resistance in farm animals becomes imperative.…”

Orquiepididimite em carneiro por Salmonella enterica sub-diarizonae: primeiro caso na América do Sul

“…Há diversas espécies e subespécies de Salmonella. Na África do Sul, foi realizado estudo recente, indicando que a subespécie mais frequente que acomete os animais neste país é a Salmonella enterica subspécie enterica serovar Typhimurium, sendo a subespécie diarizonae ausente na prevalência do estudo (Kidanemariam et al, 2010). Na Noruega, foi feito o levantamento da prevalência de Salmonella enterica subespécie diarizonae nos rebanhos ovinos, revelando variação de 0 a 45%, sendo os ovinos adultos os mais acometidos pelo agente (Alvseike e Skjerve, 2002).…”