• Rationale for not screening stool samples at each visit: Participants will not be screened for helminth infection at enrollment or during the course of this study. The only testing for helminth infection status will occur at the final visit. The rationale for this design is principally due to the study objectives. The study is designed to assess the potential benefit of empiric helminth therapy in HIV-1 infected individual's not yet meeting criteria for initiation of antiretroviral medications. As such, it is important to determine if HIV infected individuals in areas of moderate helminth prevalence (20-40%) would benefit from a program of empiric deworming as part of their pre-HAART care package. It is critical that participants be enrolled regardless of helminth infection status in order to determine if empiric therapy should be considered as a useful addition to the care package currently provided to these individuals.