 Measurements: Household diaries and monthly visits. Primary caregivers will be asked to keep a diary regarding the health of study participants for the duration of the study 13 months. Information on illnesses, treatments given, visits to health care facilities, and health care expenditures will be collected. Study personnel will visit the households monthly to collect completed diaries. At each visit, questionnaires will be administered to gather additional data on the health of the participants and treatment seeking behaviour. 