Table 1.

Dipstick detection of Vibrio cholerae-containing water samples incubated in alkaline peptone water (APW).

V. cholerae serogroup O1			V. cholerae serogroup O139
CFU/1 mL water added to APW	Incubation time/temperature		CFU/1 mL water added to APW	Incubation time/temperature
	6 h/37°C	24 h/22°C		6 h/37°C	24 h/22°C
2000	+	+	1800	+	+
200	+	+	180	+	+
20	-	+	18	-	+
2	-	+	2	-	+
0	-	-	0	-	-

Crystal VC test was read as positive (+) if V. cholerae O1 or O139 and control bands were visible, or negative (-) if only the control band was visible, according to manufacturer’s instructions.