Flow diagram of the participants and size of surveillance samples enrolled along the study.

<p>*In Lapacho Alto community 9 months went by between the first and the second intervention and 14 months between second and third intervention. ∞In Kilometro 6 the period between first and second intervention was 9 months and between second and third intervention was 20 months.</p

Comparison of relative IgG titers against <i>S</i>. <i>stercoralis</i>, between baseline and first and second follow-up*.

<p>* Relative IgG titers (measured IgG units/selected cutoff) reported.</p

Adjusted Odds Ratios and 95% Confidence Intervals of risk factors associated with skin-penetrators and orally-ingested STH infection (n = 771)*.

<p>* The model was corrected for the possible confounders of age and sex.</p

Characteristics of the study groups of soil transmitted helminths infection (n = 771).

<p>*: Crude odds ratio reported.</p><p>Characteristics of the study groups of soil transmitted helminths infection (n = 771).</p

Description of the baseline STH prevalence and coverage of the first Preventive Chemotherapy (PC) campaign by community.

<p>Description of the baseline STH prevalence and coverage of the first Preventive Chemotherapy (PC) campaign by community.</p

Map of the study location, Orán, Tartagal and Pichanal, Northeast of Salta province, Argentina.

<p>Map of the study location, Orán, Tartagal and Pichanal, Northeast of Salta province, Argentina.</p

Comparison of baseline measurements between subjects of the surveillance group infected and uninfected with hookworm and S. stercoralis (n = 397).

<p>Comparison of baseline measurements between subjects of the surveillance group infected and uninfected with hookworm and S. stercoralis (n = 397).</p

Demographic and epidemiologic characteristics of the study population, N = 771.

<p>†: Preschool-age children (1 to 4 years old).</p><p>‡: School-age children (5 to 14 years old).</p><p>•: Adolescents and adults (≥ 15 years old).</p><p>*Categorization of water supply and sanitation as improved or unimproved is based in the WHO/UNICEF JMP definitions [<a href="http://www.plosntds.org/article/info:doi/10.1371/journal.pntd.0004111#pntd.0004111.ref026" target="_blank">26</a>,<a href="http://www.plosntds.org/article/info:doi/10.1371/journal.pntd.0004111#pntd.0004111.ref027" target="_blank">27</a>].</p><p>Demographic and epidemiologic characteristics of the study population, N = 771.</p

Distribution of sanitation facilities and water supply available in the study population (n = 771).

<p>A) Sanitation facilities. B) Water sources.</p

Correlation between hookworm´s infection intensity and hemoglobin level.

<p>Correlation between hookworm´s infection intensity and hemoglobin level.</p