Researchers used fecal samples and post code information from patients at four public hospitals in Sydney to determine that Blastocystis infection is more likely to occur in certain geographic regions. A total of 910 records were examined for patients seen from 2007-2010, and 580 cases with post code data were examined. Blastocystis was found in 57% of the samples, Giardia in 27%, and D. fragailis in 12%. Age prevalnece decreased up to age 24, but increased from age 25 onward. The full text text of the paper is available in the Journal of Public Health Research.