2.4. Low pH and high bile salt concentration tolerance test
The isolates were incubated in 5mL MYP broth at the previously
described culture condition. The 24-h incubated cells were centrifuged
at 2000 g for 10 min. The cell plates were suspended in PBS
(pH 2.5) or 0.3% (w/v) oxgall solution, followed by incubation for 3 h
at 37 C. The cells resistant to lowpHand high bile salt concentration
were calculated by using the pour plate technique on MYP agar and
compared with the isolates in normal PBS for 0 and 3 h. Each examinationwas
conducted twice with three repetitions for each time.