Table 1. Transcript levels of virulence factor encoding genes in the presence of different carbon sources.

gene	glc/lactate	glc/galactose	glc/succinate	glc/GlcNAc	glc/sucrose	glc/potato starch	glc/rice starch	glc/75 mM glc	glc/111 mM glc
tcpA	16.7	9.6	32.1	0.9	1.1	2.7	4.7	1.1	1.4
tcpB	15.7	10.3	18.9	1.0	1.2	3.4	8.9	1.1	1.5
ctxA	6.2	6.3	5.0	1.0	1.1	2.5	3.5	1.2	1.7
ctxB	5.1	5.7	4.1	0.9	1.0	2.5	3.5	1.4	1.8

Virulence gene expression in V. cholerae cultures that were grown in the presence of 50 mM glucose (glc) compared with cells that were grown with the indicated carbon sources. The fold differences are indicated. GlcNAc, N-acetylglucosamine.