2007, Number 6
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Rev Invest Clin 2007; 59 (6)
Prevalence of Salmonella sp. in foods in Tamaulipas, Mexico, during 2005
Charles-Hernández GL, Medina-Solís CE, Hernández-Romano J
Language: Spanish
References: 33
Page: 437-443
PDF size: 70.74 Kb.
ABSTRACT
Objective. To determine the prevalence of
Salmonella sp. in foods
obtained from Tamaulipas sanitary jurisdictions during 2005.
Materials
and methods. Several kinds of foods were taken from the
State of Tamaulipas from January to December 2005, which were
analyzed in the Public Health State Laboratory of Tamaulipas. If
the food fulfilled with the acceptance criteria, it was analyzed looking
for
Salmonella sp. in agreement with NOM-114-SSA1-1994.
Positive foods were sent to the National Institute of Epidemiological
Reference and Diagnostic (INDRE) to determine
Salmonella
species and serovariety. Data were collected in a database and
analyzed using χ
2 and Fisher’s exact test in STATA 8.2 software.
Results. 24 of 1300 analyzed foods were positives to
Salmonella sp.
(1.9%, CI 95% 1.2 - 2.7). By sanitary jurisdiction, Victoria showed
the highest prevalence of positive results (3.9%). When the analysis
was carried out by “north jurisdictions”
versus “south jurisdictions”,
south jurisdictions showed a high prevalence of
Salmonella in
foods (0.9% vs 2.5%, p ‹ 0.05). Sausage was the most contaminated
food (20.0%). A higher percentage of positive results was noticed in
terrestrial foods than in sea-derived foods (2.3% vs 0.3%; p < 0.05).
In January (5.5%) and May (3.7%) the highest prevalence of positive
results was found; without significant difference by year seasons (p
› 0.05). The most common bacterial species was
Salmonella enterica,
serovariety enteritidis, which was found in 58.3% (n = 14) of positive
foods.
Conclusions. The jurisdictions with the highest
prevalence of
Salmonella in foods were identified. Terrestrial foods
showed more
Salmonella contamination. The results show that
thanks to epidemiologic surveillance it is possible to identify potential
sources of salmonelosis outbreaks. A bigger research effort it is
necessary to extent the epidemiologic surveillance activities and
their results, by one side toward the kind of foods initially identified
as “high risk foods”, and by other side, to other regions of
Mexico in order to know the distribution of this pathogen and establish
adequate preventive measures.
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