Table 2. STH prevalence and intensity at the 12, 18 and 24 months of age study visits in preschool children in Iquitos, Peru, September 2011 to July 2016.
| 12 monthsa | 18 monthsb | 24 monthsc | |
|---|---|---|---|
| Ascaris | |||
| Prevalence [% (n)] | 11.0 (97) | 23.3 (204)e | 30.7 (269)e |
| Intensity (epgg) [mean (sd)] | 329.9 (1,416.6)d | 1,468.3 (7,661.6)f | 2,304.2 (11,987.5)e |
| Prevalence of moderate/ heavy intensity infection [% (n)] | 2.0 (9)d | 5.6 (24) f | 9.6 (84)e |
| Trichuris | |||
| Prevalence [% (n)] | 2.5 (22) | 7.7 (67) e | 21.8 (191)e |
| Intensity (epgg) [mean (sd)] | 26.5 (261.3)d | 45.0 (346.5) f | 46.7 (225.5)e |
| Prevalence of moderate/ heavy intensity infection [% (n)] | 0.7 (3)d | 0.7 (3) f | 0.7 (6)e |
| Hookworm | |||
| Prevalence [% (n)] | 0.34 (3) | 0.57 (5) e | 1.37 (12)e |
| Intensity (epgg) [mean (sd)] | 1.7 (26.8)d | 3.6 (48.3) f | 1.4 (17.6)e |
| Prevalence of moderate/ heavy intensity infection [% (n)] | 0 (0)d | 0 (0) f | 0 (0)e |
| Any STH | |||
| Prevalence [% (n)] | 12.4 (109) | 27.9 (244) e | 41.1 (360)e |
a At the one year of age visit, 449 (51%) stool specimens were analyzed using the Kato-Katz technique and 431 (49%) stool specimens were analyzed using the direct smear technique
b At the 18 months of age visit, 428 (48.9%) stool specimens were analyzed using the Kato-Katz technique and 448 (51.1%) stool specimens were analyzed using the direct smear technique
c At the 24 months of age visit, all available stool specimens were analyzed using the Kato-Katz technique
d Data available for 449 participants (who had their stool specimen analyzed with the Kato-Katz technique)
e Data available for 876 participants
f Data available for 428 participants (who had their stool specimen analyzed with the Kato-Katz technique)
g Eggs per gram of stool