Fig. 2.

Host ranges of the phages infecting different Flavobacterium sp. strains. Dark gray squares indicate infection; white indicates no infection, and light gray squares mark the strain which was originally used for isolation of the phage. The numbers at right and bottom are the total number of different host ranges of the phage and susceptibility of bacteria to phages, respectively. The approximate titer of each phage on the bacteria is marked with plus signs (+, ≤10⁵; ++, 10⁶ to 10⁸; and +++, ≥10⁹ PFU/ml). The titer (PFU/ml) of the phage on the isolation strain is marked on the light gray squares. In parentheses after the name of the bacterial strain is the abbreviation of the place of isolation, which is also included in the phage nomenclature (Fig. 1). F. columnare phages infected only one specific F. columnare RISA group, and they are listed in Table 2.