Notifiable food- and waterborne diseases in Massachusetts, 1991–2004*.

NT = non-typhoid; No. = number; SHR = surveillance to hospitalization ratio (ratio between the number of cases reported through surveillance and the number of hospitalizations observed over the same time period).* Surveillance for Cryptosporidium commenced in late 1994; hospitalization data for the period 1991–1994 were censored in the calculation of the SHR for this pathogen.†Per 100,000 persons aged ≥65 years.Data reflect the number of cases in persons 65 years old and older reported through the state surveillance system and the number of hospitalized cases as documented by the Center for Medicare and Medicaid Services database.