201416 Shigellosis in New Mexico, 2004-2008

Sunday, November 8, 2009

Cynthia S. Nicholson, MS , Institute for Public Health/Emerging Infections Program, University of New Mexico Health Sciences Center, Albuquerque, NM
Lisa M. Butler, MPH , Institute for Public Health/Emerging Infections Program, University of New Mexico Health Sciences Center, Albuquerque, NM
Sarah L. Lathrop, DVM, PhD , Office of the Medical Investigator/Dept. of Pathology, University of New Mexico, Albuquerque, NM
Since 2004, New Mexico (NM) has been collecting epidemiologic and laboratory information on confirmed cases of Shigella through its participation in the CDC's Emerging Infections Program. Between 2004 and 2008, there were 708 laboratory-confirmed cases of shigellosis in NM, with the highest number of cases (172) reported in 2006, with a rate of 8.5 per 100, 000. Commonly reported serotypes included S. sonnei (66%), S. flexneri (22%), S. boydii (2.4%), and S. dysenteriac (0.4%), consistent with nationally reported serotype percentages. The highest percentage of cases each year was seen in the age group 5-19 (30%) and predominantly in females (53%). Of the 419 (59%) cases with known ethnicity, 288 (41%) were Hispanic, and 130 (18%) were Non-Hispanic. Of the 502 (71%) cases with known race, 347 (49%) were white, 147 (21%) were Native American, 5 (1%) were Asian/Pacific Islander and <1% were black or multi-race, indicating an over-representation of Native Americans compared to NM's population. Analysis of data from the U.S. National Notifiable Diseases Surveillance System indicated increased risks for certain foodborne and waterborne diseases in U.S. counties that share a border with Mexico. Four of NM's southernmost counties share a border with Mexico, and this unique region represented 33% of all shigellosis cases reported between 2004 and 2008, while representing only 15% of New Mexico's total population. Border county rates ranged from 6.8 per 100,000 in 2007 to 17.0 per 100,000 in 2006. Continued laboratory-based surveillance of Shigella will help understand these regional variations in incidence.

Learning Objectives:
Describe the incidence of shigella in New Mexico. Compare rates of Shigella infection by geographical region and ethnicity within New Mexico.

Keywords: Infectious Diseases, Surveillance

Presenting author's disclosure statement:

Qualified on the content I am responsible for because: I have been conducting public health surveillance at the University of New Mexico Health Sciences Center for 20 years. I am currently working as a foodborne disease epidemiologist with the New Mexico Emerging Infections Program.
Any relevant financial relationships? No

I agree to comply with the American Public Health Association Conflict of Interest and Commercial Support Guidelines, and to disclose to the participants any off-label or experimental uses of a commercial product or service discussed in my presentation.