Giardiasis, 2009

During 2009, 678 cases of Giardia infection (13.0 per 100,000) were reported. This represents a 11% decrease from the 765 cases reported in 2008 and a 39% decrease from the median number of cases reported annually from 1998 through 2008 (median, 1,105, cases; range, 765 to 1,556). Of the total number of Giardia cases for 2009, 12% represented positive tests during routine screenings of recent immigrants and refugees.

The median age for all cases reported in 2009 was 26.5 years (range, 1 month to 104 years). The median age among non-immigrant cases was 42 years (range, 1 month to 104 years). Twenty-two percent of cases were less than 5 years of age, and 21% of cases were over 50 years of age. No outbreaks of giardiasis were identified in 2009.

Updated Friday, November 19, 2010 at 03:16PM