To count L. rhamnosus CTC1679 in faeces, faecal samples (of approximately
5 g) were diluted 1/10 in SS and homogenized in a Masticator
Classic (IUL S.A.) for 1 min. Ten-fold serial dilutions were plated on
Rogosa agar (Merk) and M-RTLV agar for the counts of total LAB and
L. rhamnosus CTC1679, respectively. The plates were incubated anaerobically
at 37 °C for 72 h. From each sample, five representative colonies
selected from the M-RTLV agar plates with a typical morphology of
L. rhamnosus CTC1679 were streaked onto MRS agar. The samples
were then submitted to the pre-PCR treatment with Chelex 100 and
confirmed by RAPD-PCR analysis with the primer KS. The amplification
products were analysed by the QIAxcel System (QIAGEN) as described
above (2.6).