We are analyzed forty samples of raw milk commercialized at the Callao Market between January and March 2009 using presumptive method for β-lactamics and tetracycline antibiotic residues from IDEX laboratories, to comply with the limits of sensitivity of residues of the FDA. We found 40% of samples tested positive for β-lactamic residues in raw milk. There were no positive outcame to analyze tetracyclines. The results suggest that we should establish policies for legislation, regulation and training and that the NTP 202.001.2003 should be reviewed. The results suggested that should be established policies for legislation, regulation and training, and the NTP 202. 00102003 should be reviewed.

This research was conducted using the Polymerase Chain Reaction (PCR) to detect heat-labile toxin of Escherichia coli in 24 fresh cheeses manufactured with cow and goat milk. The advantages of the PCR technique, over other analysis techniques, are reliability and rapidity to obtain the results. 24 samples of cheese (from cow and goat milk) were studied obtaining 58.33% of positive cases; 72.72% were positive with fresh goat milk and 46.16% of cow milk. Moreover, the X2 analysis showed, with 99% reliability, that the positive and negative results of the samples tested did not depend on the type of cheese used but did so on other factors, such as good manufacturing practices and standardization of the procedure.

We are analyzed forty samples of raw milk commercialized at the Callao Market between January and March 2009 using presumptive method for β-lactamics and tetracycline antibiotic residues from IDEX laboratories, to comply with the limits of sensitivity of residues of the FDA. We found 40% of samples tested positive for β-lactamic residues in raw milk. There were no positive outcame to analyze tetracyclines. The results suggest that we should establish policies for legislation, regulation and training and that the NTP 202.001.2003 should be reviewed. The results suggested that should be established policies for legislation, regulation and training, and the NTP 202. 00102003 should be reviewed.

En la presente investigación se detectó presencia de toxina termolábil de Escherichia coli, mediante la técnica de la reacción en cadena de la polimerasa (PCR), en 24 muestras de quesos frescos manufacturados con leche de cabra y vaca. Se optó por el método de PCR por las ventajas que ofrece respecto a otros métodos de análisis, en cuanto a confiabilidad y rapidez de obtención de los resultados. De 24 muestras de queso (cabra y vaca) analizadas, el 58,33% fueron positivas; 72,72% de las muestras de queso fresco de cabra y 46,16% de las muestras de quesos de leche de vaca. Por. otra parte, el análisis de X2 demostró, con 99% de confiabilidad, que los resultados positivos y negativos de las muestras analizadas no dependen del tipo de queso sino de otros factores, como las buenas prácticas de manufactura y la estandarización del procedimiento.