Acid resistance of Escherichia coli O157:H7 strains UT 10 and UT 15 were determined in traditional Amasi fermented for 3 days at ambient temperature (ca 30 degrees C) and commercial Amasi fermented at 30 degrees C for 24h and stored at 7 degrees C for 2 days. Escherichia coli O157:H7 counts in commercial Amasi were detected at 2.7 log(10)cfu/ml after 3 days while those in traditional Amasi could not be detected after the same period. There was no significant difference (p< or =0.05) in the survival of acid adapted (AA) and non-adapted (NA) E. coli O157:H7 in traditional Amasi, while in commercial Amasi, the NA strain survived significantly (p< or =0.05) better than its AA counterpart. Regardless of prior adaptation to acid, E. coli O157:H7 can survive during fermentation and storage of fermented goat milk Amasi. Also, the fermentation time, pH and storage temperature affects the survival of E. coli O157:H7 in the fermented milk.