Bacteriophage ST1 was stable in soybean milk and jelly grass drink over 24 h of observation period. However, it lost infectivity in guava juice and orange juice within 3 h. Stability of bacteriophages has been reported not only in beverages but also on solid foods. Carlton et al. reported no significant change of Listeria bacteriophage P100 titer on the surface of cheese after 6 days. This was also observed for Salmonella and Campylobacter jujeni bacteriophages on chicken skin for at least 48 h