Partial 16S rRNA gene was amplified using primer pair S-D-Bact-0341-b-S-17 (5-CCTACGGGNGGCWGCAG-3) and S-D-Bact-0785-a-A-21 (5-GACTACHVGGGTATCTAATCC-3. Normalised PCR products were sequenced on an Illumina MiSeq Desktop Sequencer using V3 chemistry and 2 x 300 cycles.