2005 - Salmonellosis

 

Table 1. Salmonellosis Cases by Race and Sex, Indiana, 2005

  2005 2001-2005
Cases Rate* Cases
Total 686 10.94 2,948
Race
   White 407 7.33 1,827
   Black 39 7.03 176
   Other 11 6.75 47
   Not Reported 229 - 898
Sex
   Male 309 10.01 1,352
   Female 375 11.78 1,581
   Not Reported 2 - 15
*Rate per 100,000 population based on the U.S. Census Bureau’s population data as of July 1, 2005

Salmonellosis is a bacterial disease usually transmitted through raw or undercooked foods of animal origin or foods cross-contaminated by animal products or feces. It can also be transmitted person to person. Common reservoirs include poultry; swine; cattle; reptiles, such as turtles, snakes, and lizards; and wild birds, such as ducks and geese.

In 2005, there were 686 cases of salmonellosis reported in Indiana, for a rate of 10.94 cases per 100,000 population (Table 1). This represents a 30 percent increase in the incidence rate from 2004 (8.45). Figure 1 shows the number of reported cases for 2001-2005. The incidence was greatest during the summer months (Figure 2). Figure 3 shows age-specific rates were greatest among infants less than 1 year of age (46.46), followed by preschoolers aged 1-4 years (22.07), and adults aged 80 years and older (14.92). Females (11.78) were more likely to be reported with salmonellosis than males (10.01). Whites (7.33) were slightly more likely to be reported than blacks (7.03) or other races (6.75); however, 229 cases (33%) did not report race data.

The incidence rates were highest among the following counties reporting five or more cases:
Montgomery (34.0), Perry (31.5), and Harrison (21.7). Figure 4 shows Indiana counties reporting five or more cases. There were no outbreaks of salmonellosis reported in Indiana in 2005.

There are over 3,000 different Salmonella serotypes that differ in somatic and flagellar antigens. The Indiana State Department of Health (ISDH) requests that clinical laboratories submit all positive Salmonella isolates to the ISDH Laboratories for free confirmation and serotyping. During 2005, serotypes were determined for approximately 62 percent of the 686 cases identified. Of the 364 isolates of known serotype, 89 (21%) were typhimurium; 88 (21%) were enteriditis; 47 (11%) were Newport; 24 (6%) were Heidelberg; and 175 (41%) were other serotypes.