Table 1.

Primer pairs used in this study and the covered variable regions

Primer pair	Forward/ reverse sequence	Covered variable region
27F/534R	AGAGTTTGATCCTGGCTCAG/ ATTACCGCGGCTGCTGG	V1-V3
357F/926R	CCTACGGGAGGCAGCAG/ CCGTCAATTCMTTTRAGT	V3-V5
341F/785R	CCTACGGGNGGCWGCAG/ GACTACHVGGGTATCTAATCC	V3-V4
341F/1062R	CCTACGGGNGGCWGCAG/ CRRCACGAGCTGACGAC	V3-V6
8F/785R	AGRGTTYGATYMTGGCTCAG/ TACHVGGGTATCTAAKCC	V1-V4
27F/1492R	AGRGTTYGATYMTGGCTCAG/ RGYTACCTTGTTACGACTT	V1-V9

Note that he primer coordinates are adapted from the original references, which might apply different coordinate systems