2.7. Acid sensitivity
The survival of the isolate under different pH conditions [22] was
evaluated. Cell suspensions from 48 h cultures were incubated at
37 C for 1 h with glycine-HCl buffer (pH 2.0), McIlvain’s buffer (0.2M
Na2HPO4, 0.1Mcitric acid, [pH 4.0]), and 0.1Mphosphate buffer (pH
7.0). After incubation, serial 10-fold dilutions of the cell suspensions
in 150 mM NaCl were plated onto brucella agar plates containing
3% horse serum and incubated for 72 h at 37 C to determine CFU.