. 1998 Aug;66(8):3752–3757. doi: 10.1128/iai.66.8.3752-3757.1998

TABLE 2.

Analysis of 47 culture-positive stools collected during June and July 1997 in Bangladesh for the presence of cell-free CTXΦ^a

No. of stools analyzed	Serotype and biotype of V. cholerae strain isolated	No. of stools^a positive for CTXΦ	No. (%) of strains producing extracellular CTXΦ
No. of stools analyzed	Serotype and biotype of V. cholerae strain isolated	No. of stools^a positive for CTXΦ	Induced with mitomycin C	Without mitomycin C
36	O1, El Tor	0	7 (19.44)	0
11	O139	0	5 (45.45)	0
47 (total)		0^b	12 (25.53)	0

All culture-positive stools were negative for the presence of CTXΦ both in the DNA probe assay and in the in vivo assay in infant mice (see the text for details).