A Study of Drug-Drug Interaction Between Danoprevir Coadministered With Low-Dose Ritonavir and Tenofovir Disoproxil Fumarate or Atazanavir

Inclusion Criteria: * Male and female volunteers, 18 to 55 years of age, inclusive * Body weight \>/= 55 kg * Body mass index (BMI) 18.0 - 32.0 kg/m2 * Healthy non-smoking subjects. Healthy status will be defined by absence of evidence of any active or chronic disease following a detailed medical and surgical history and a complete physical examination * Medical history without major recent or ongoing pathology * Females of childbearing potential and males and their female partners of childbearing potential must agree to use 2 forms of contraception, 1 of which must be a barrier method, during the study and for 90 days after the last drug administration Exclusion Criteria: * Pregnant or lactating women or males with female partners who are pregnant or lactating * Any history of clinically significant disease or condition * Positive for drugs of abuse at screening or prior to admission to the clinical site * Positive for hepatitis B, hepatitis C or HIV infection * Current smokers or subjects who have discontinued smoking less than 6 months prior to first dose of study medication * Use of hormonal contraceptives (e.g. birth control pill, patches, or injectable, implantable devices) within 30 days before the first dose of study medication * Use of an investigational drug or device within 30 days of the first dose of study medication (6 months for biologic therapies) or 5 half-lives of the investigational drug, whichever is longer * History of drug-related allergy reaction * History (within 3 months of screening) of alcohol consumption exceeding 2 standard drinks per day on average