Discussion on the New and the Old Country Mark in Detecting the Coliform Bacteria

For the application of the new country mark in practice detection, the lactose method and the LST method were compared. Lactose method and LST method were used to determine the different consistence bacterium fluid of the coliform bacteria and pollution-free eggs, beverages and tablewares, which had 110 samples in all. The result of two different detection methods had no difference in statistics. Within the MPN 95 % confidence interval, lactose method and LST method were credible and accurate. Compared with lactose method, the unqualified rate of LST method in sample detection was increased by an average of 48.4 %. Although there was no difference between these two kinds of methods in statistics, the unqualified rate of LST method was absolutely higher than lactose method. This result showed that LST method could reduce the rate of false negatives in sample detection.