FIG. 1.
UV254 radiation sensitivities of various N. meningitidis strains. Strains BL892, B1940, BF2, BF40, BF65, and BF8961 were grown to late logarithmic phase. Serial dilutions (10 μl) were spotted onto agar plates containing GC agar plus Vitox supplement. Irradiation was achieved by opening the plates under a UV254 germicidal lamp at a distance of 15 cm for different times in the absence of daylight illumination as detailed in Materials and Methods. Survival fractions are reported on the ordinate. UV fluence values are indicated on the abscissa.