Statistical design of THRio: a phased implementation clinic-randomized study of a tuberculosis preventive therapy intervention

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Abstract
Background Tuberculosis (TB) is a major public health problem in Rio de Janeiro, where a high proportion of HIV-infected adults are co-infected with latent TB. Health officials in Brazil have recommended that HIV patients be tested for TB infection and given TB prophylaxis (isoniazid) if positive. In practice, although Brazil is a model for provision of antiretroviral therapy to patients with advanced HIV disease, relatively few such patients receive TB testing and prevention services.

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