Viability of L. acidophilus has previously been reported to be higher in yogurt with pH between 4.1 and 4.5 ( Kailasapathy et al., 2008), a similar pH range to that recorded in the present study. This is in contrast however to the findings of Vinderola et al. (2002), who reported higher loss in cell viability for L. acidophilus under acidic conditions (pH 4.0–5.0).