Please select the eligibility criteria that correspond to the clinical trial below.
Title: Solar Water Disinfections: Randomized Intervention Trial
Brief Summary: The importance of waterborne gastrointestinal illness throughout the developing world, the existence of a cheap and effective intervention (SODIS), the concurrent limited dissemination program for SODIS, the need for a controlled evaluation of the effectiveness of SODIS under actual field conditions, and the experience of our tri-national collaborative research team in successfully conducting large scale drinking water intervention and observational studies in both the United States and the developing world encourage us to propose the following randomized controlled trial in which our specific aims are to:

* Evaluate the hypothesis that SODIS reduces the incidence of gastrointestinal illness in 660 children under the age of five years in rural Bolivia that are randomly selected from 22 villages ;
* Define, through an extensive microbiologic testing component, the baseline rates of pathogen-specific diarrheal illnesses and the pathogens responsible for the differences in diarrheal illness between active and control groups;
* Document the actual use and acceptance of SODIS by participants in the study;
* Assess the cost-effectiveness of SODIS and the social and economic impact of SODIS at household level;
* Examine through mathematical disease modelling the effects of the presence of multiple transmission pathways within a village on the preventable fraction estimate due to the introduction of SODIS.


Options:
A: Inclusion Criteria:

(1) Infants (target child) will be eligible to participate in the study if they are:

1. They are in utero at the baseline survey
2. Their parents/guardians are planning to stay in the study village for the next 12 months (if a mother is planning to give birth at her natal home and then return, she will still be a candidate for enrollment)

(2) Children \< 36 months old at baseline that are living in the compound of a target child will be eligible to participate in diarrhea measurement if:

1. They are \< 36 months old at the baseline survey
2. Their parents/guardians are planning to stay in the study village for the next 12 months

(3) Children 18 - 27 months old at baseline that are living in the compound of a target child will be eligible to participate in intestinal parasite specimen collection if:

1. They are 18 - 27 months old at the baseline survey
2. Their parents/guardians are planning to stay in the study village for the next 12 months
B: Study Population Description:

The subject population will be young children and their mothers/guardians living in several contiguous districts of Western Province, in the rural areas outside the towns of Bungoma and Kakamega. Communities must meet the following criteria:

* Located in a rural area (defined as villages with \<25% residents living in rental houses, \<2 gas/petrol stations and \<10 shops)
* Not enrolled in ongoing WASH or nutrition programs
* No chlorine dispensers at water sources installed by programs separate from the present study
* Majority (\>80%) of households do not have access to piped water into the home
* At least six eligible pregnant women in the cluster at baseline.

From enrolled communities, household compounds will be enrolled if they meet the following criteria.

Inclusion Criteria:

1. One or more women who self-identify as pregnant at the time of the baseline survey
2. The woman plans to stay in the community for the next 12 months.

Exclusion Criteria:

(1) The study excludes households who do not own their home to help mitigate attrition during follow-up.
C: Inclusion Criteria:

* Consent of Community Leadership
* Permanent residence in village
* Consent of both parents and all other adult household members
* Age 6 months to 5 years
D: Inclusion Criteria:

* Presence of one or more children aged less than 5 years in the household

Exclusion Criteria:

* Chlorinated piped water source available in household

Answer: C