Salmonella enterica serotype Typhi is a Gram-negative foodborne pathogen¹ that can cause a severe, but rare foodborne disease. A publication by Scallan et al.² in 2011 estimated that 197 human foodborne salmonellosis cases, including 0 deaths, occur annually in the US.

Key laboratories studying various aspects of foodborne salmonellosis in the US and Canada include:

Key laboratories studying various aspects of foodborne salmonellosis in Europe include:

Key laboratories studying various aspects of foodborne salmonellosis in South and Latin America include:

Key laboratories studying various aspects of foodborne salmonellosis in Asia and Australia include:

Additional resources on Salmonella enterica serotype Typhi:
A number of key sources on Salmonella enterica serotype Typhi and salmonellosis are available. 

 References
¹http://en.wikipedia.org/wiki/Salmonella_enterica
²Scallan et al. 2011.Emerging Infectious Diseases 17:7-15  PMID:21192848