The general purpose of the project is to analyse soil-transmitted helminthiases (STH) in a highly endemic area in northern Argentina with a multidisciplinary approach. The specific objectives are to evaluate the local epidemiology of STH, validate a new diagnostic serology method for S. stercoralis and evaluate the efficacy and safety of a mass drug administration regimen with albendazole and ivermectin.

Inclusion Criteria:

• All persons that are living in the working area at the time of the intervention and wish to participate in the study.

Exclusion Criteria:

1. All persons that live within the study area but do not want to participate in the study.
2. Pregnant women or women who are likely pregnant.
3. Women during the first post-partum week if they are breastfeeding.
4. Children who weigh less than 15 kg.
5. Persons with a history of hypersensitivity or intolerance to ivermectin, albendazole or to the components that make up those drugs.