Table 2. Characteristics of vibriophages isolated from surface water samples in Bangladesh between January 2001 and November 2003.

Phage designation	Host specificity	Plaque type	Isolation of lysogens*	Phage production by lysogens*	Crossimmunity	DNA homology
JSF1	V. cholerae O1	Clear	-	-	JSF4, JSF5	JSF4, JSF5
JSF2	V. cholerae O1	Turbid	+	+	None	None
JSF3	V. cholerae O139	Clear	+†	+†	None	None
JSF4	V. cholerae O1	Clear	+†	+†	JSF1, JSF5	JSF1, JSF5
JSF5	V. cholerae O1	Clear	-	-	JSF1, JSF4	JSF1, JSF4
JSF6	V. cholerae O1 and some non-O1	Clear	-	-	None	None

^*Minus sign indicates that the phage designated was negative for the property being scored; plus sign indicates that the phage was positive for the property being scored.

^†JSF3 and JSF4 phages appear to be primarily lytic but can occasionally persistently infect a host strain. Such persistently infected cells shed virus and display viral immunity but do not show typical chromosomal junction fragments consistent with stable integration of the viral genome into the bacterial chromosome.