Fig 3. Changes in age-specific Ascaris infection rates, AsHb antibody rates, and average egg output per age group for different times before and after MDA.

Prevalence based on eggs in the stool (A) or serology (B) shows a notable reduction over all age categories between the year 2002 and 2004. While the prevalence goes back up in all age categories based on the presence of eggs in the stool in subsequent years, the percentage seropositive individuals remains low. (C) The average group egg output (sum of EPG divided by the number of people analyzed per group) is also reduced between 2002 and 2009 over all age categories. Too few subjects (less than 5) younger than 10 years of age were tested in 2007 and 2009 to produce meaningful data for this age category.