Detection of contaminant bacteria in eggs for consumption in Medellín and its Metropolitan area

摘要

Objective. Search for Salmonella and other bacteria in commercial eggs. Methods. Thirty-eight neighborhood grocery stores in the city of Medellin and its Metropolitan área were chosen at random; also from each grocery store 6 eggs were selected randomly, for a total of 228 tested eggs. Four samples from every egg were taken, 912 samples in total, which were divided in groups. Every group of samples was cultured in bacteriological media and PCR for Salmonella was performed. Results. The bacterium isolated from the samples were: Bacillus sp., Pseudomonas sp., Enterobacter sp., Serrana sp., Citrobacter sp., E. coli, Streptococcus viridans, Klebsiella sp., Staphylococcus sp., Aeromonas sp., Sarcinas sp., Acinetobacter sp., E. hermanii, Proteus and Stenotrophomonas maltophilia. All cultures and PCR were negative for Salmonella. Conclusions. According to these results, the isolation of contaminating bacteria, such as Aeromonas sp, E. coli, and S. aureus, in commercial eggs is relevant since some of them are potentially pathogenic to humans, especially children, the immunocompromised and the elderly We can conclude that from June to November 2007, the period during which the samples were taken for this current study, Salmonella was not detected in commercial eggs in the city of Medellin and it's Metropolitan Área.