Figure 2. Kinetics of bacterial growth in the presence of phage Giraffe. B. anthracis strain 7702 was grown at 37°C in tryptic soy media and 1% (v/v) of tetrazolium dye. The wells designed to receive bacteria were seeded with 10⁶ cells. Microtiter plates for the phage assay were prepared as described in materials and methods. The tests were done with (A) vegetative cells, (B) spores and (C) Giraffe-resistant B. anthracis Sterne strain 8009, a derivative of the 7702 strain.