MATERIALS AND METHODS
Thirty ice cream samples from different regions of Tabriz were collected. Enumeration of fecal coliforms and fecal streptococci according to standards of Iran No: 356, 2946 and 2198 [11] was done. Ten grams from each ice cream sample were removed aseptically homogenized in 90 ml of 1.5% peptone water, using a stomacher. The homogenized samples were inoculated onto the following media; KF streptococcus agar (Merck) incubated at 37°C for 72h, lauryl sulfate tryptose broth (Merck) incubated at 37°C for 24-48h and lactose bile brilliant green broth incubated at 45°C for 24-48h [11-13]. Statistical analysis was done using SPSS (version12) program to determine central index and dispersion index.