Figure 1.

Stability over time of the infectivity of different phages, stored at 4 °C at two different concentrations: 9 log pfu/mL (solid lines); 7 log pfu/mL (dotted lines). Phages were suspended in 5% glucose (green), 0.9% NaCl (blue), Hartmann solution (black), DPBS w/ Ca²⁺ and Mg²⁺ (red), and DPBS w/o Ca²⁺ and Mg²⁺ (yellow). Infectivity was determined by the double agar overlay method. The results are the mean values of triplicate samples of each phage at each concentration in each solution. Standard deviations are indicated. Average standard deviations of Acibel004; 14/1; PNM and ISP are 0.06; 0.15; 0.26 and 0.18, respectively. For phage ISP results were from an 8.8–8.9 log pfu/mL sample.