TABLE 1.

16S rRNA gene primers used for PCR and sequencing

Primer	Sequence (5′→3′)	E. coli positiona
516F	TGCCAGCAGCCGCGGTAA	516–533
806F	ATTAGATACCCTGGTAGTCC	787–806
806R	GGACTACCAGGGTATCTAAT	806–787
911R	GCCCCCGTCAATTCMTTTGA	930–911
1175F	GAGGAAGGTGGGGATGACGT	1175–1194
1175R	ACGTCATCCCCACCTTCCTC	1194–1175
13R	AGGCCCGGGAACGTATTCAC	1390–1371

^aE. coli position numbers are based on reference 5.