Salmonella are gram negative bacilli belonging to the family Enterobacteriaceae. They are non-spore forming, motile, facultative anaerobes. Based on somatic, flagellar and capsular antigen types, over 2,000 serotypes of Salmonella have been classified. Among these, Salmonella enterica subsp. enterica serovar Typhimurium (hereafter as S. Typhimurium) is a common causative agent of foodborne salmonellosis1. This disease has become a major global public health threat. Each year, there are an estimated 1.3 billion cases of salmonellosis that contribute towards more than three million deaths worldwide. In Thailand, street beverages such as guava juice, orange juice and soybean milk are frequently associated with S. Typhimurium contamination due to mishandling and inadequate hygiene during food preparation distribution and selling. Therefore, they are among most common causes of salmonellosis in Thailand.