detected, while other countries had prevalence of up to 80% [1]. S. Typhymurium was the predominant
Salmonella serotype for many decades. However, S. Enteritidis has recently emerged as a major serotype
in human infections and in chicken contamination [2]. Gillespie et al. [3] considered that most outbreaks
are linked to cross-contamination and inadequate heat treatment, strongly associated to the use of raw
shell eggs and occurring more likely in spring and summer. Some studies highlight the appearance of
new and stronger multidrug-resistant strains [4,5]. The incidence of multidrug-resistant Salmonella
Typhimurium infections in humans has increased substantially in the past two decades [6], implying that
S. Typhimurium constitutes an increasing health problem in large parts of the world and which
emphasizes the importance of surveillance and control programs. Salmonella is a genus of rod-shaped
Gram-negative enterobacteria, oxidase negative and catalase positive. The clinically discernable
syndromes of Salmonellosis occurring in man are acute onset of fever, abdominal pain, diarrhoea, nausea
and sometimes vomiting.