| 693 | Humans |
| 511 | Female |
| 499 | Ghana |
| 442 | HIV Infections |
| 410 | Male |
| 393 | Adult |
| 275 | Adolescent |
| 235 | Middle Aged |
| 151 | Young Adult |
| 119 | Acquired Immunodeficiency Syndrome |
| 118 | Child |
| 112 | Cross-Sectional Studies |
| 111 | Prevalence |
| 97 | Health Knowledge, Attitudes, Practice |
| 96 | HIV-1 |
| 91 | Developing Countries |
| 88 | Risk Factors |
| 87 | Africa South of the Sahara |
| 85 | Africa |
| 83 | Sexual Behavior |
| 82 | Infant |
| 78 | Pregnancy |
| 76 | Child, Preschool |
| 71 | Aged |
| 60 | Surveys and Questionnaires |
| 60 | Anti-HIV Agents |
| 57 | Africa, Western |
| 54 | Socioeconomic Factors |
| 47 | Infant, Newborn |
| 47 | HIV Seropositivity |
| 46 | Condoms |
| 45 | HIV-2 |
| 43 | CD4 Lymphocyte Count |
| 41 | Virus Diseases |
| 39 | Rural Population |
| 39 | Disease |
| 38 | South Africa |
| 38 | Sexually Transmitted Diseases |
| 37 | Mass Screening |
| 37 | Antiretroviral Therapy, Highly Active |
| 36 | Retrospective Studies |
| 34 | AIDS-Related Opportunistic Infections |
| 32 | Pregnancy Complications, Infectious |
| 32 | Population Surveillance |
| 32 | Coinfection |
| 31 | Health Education |
| 31 | Family Planning Services |
| 31 | Demography |
| 30 | Treatment Outcome |
| 30 | Molecular Sequence Data |
| 28 | Viral Load |
| 28 | Tuberculosis |
| 28 | Malaria |
| 27 | Seroepidemiologic Studies |
| 27 | Age Factors |
| 26 | Phylogeny |
| 26 | Patient Acceptance of Health Care |
| 26 | Logistic Models |
| 26 | Hepatitis B |
| 26 | Health Surveys |
| 26 | Cause of Death |
| 26 | Attitude to Health |
| 25 | Sex Factors |
| 25 | Risk-Taking |
| 24 | Sexual Partners |
| 24 | Genotype |
| 23 | Time Factors |
| 23 | Sex Work |
| 23 | Health Services Accessibility |
| 23 | Data Collection |
| 23 | Counseling |
| 23 | Case-Control Studies |
| 23 | Anti-Retroviral Agents |
| 22 | Poverty |
| 22 | Interviews as Topic |
| 22 | Incidence |
| 21 | Tuberculosis, Pulmonary |
| 21 | Prospective Studies |
| 21 | Infectious Disease Transmission, Vertical |
| 21 | HIV Antibodies |
| 21 | Economics |
| 21 | DNA, Viral |
| 21 | Blood Donors |
| 20 | Sensitivity and Specificity |
| 20 | Focus Groups |
| 20 | Educational Status |
| 19 | Urban Population |
| 19 | RNA, Viral |
| 19 | Qualitative Research |
| 19 | Kenya |
| 19 | Hospitals, Teaching |
| 19 | Health Planning |
| 19 | Health Personnel |
| 19 | AIDS Serodiagnosis |
| 18 | Program Evaluation |
| 18 | Population |
| 18 | Hepatitis C |
| 18 | Health Services Needs and Demand |
| 18 | HIV |
| 18 | HIV Seroprevalence |
| 18 | Behavior |
| 18 | Asia |
| 18 | Antibodies, Viral |
| 18 | Aged, 80 and over |
| 18 | Adolescent Behavior |
| 17 | Research |
| 17 | Nigeria |
| 17 | Family Characteristics |
| 17 | Enzyme-Linked Immunosorbent Assay |
| 17 | Emigration and Immigration |
| 17 | Delivery of Health Care |
| 16 | Stereotyping |
| 16 | Sequence Analysis, DNA |
| 16 | Organization and Administration |
| 16 | Hospitalization |
| 16 | Education |
| 16 | Comorbidity |
| 16 | Communication |
| 15 | Social Support |
| 15 | Residence Characteristics |
| 15 | Multivariate Analysis |
| 15 | International Cooperation |
| 15 | Health Policy |
| 15 | Culture |
| 15 | Cohort Studies |
| 15 | CD4-Positive T-Lymphocytes |
| 15 | Autopsy |
| 14 | Polymerase Chain Reaction |
| 14 | Odds Ratio |
| 14 | Mothers |
| 14 | Infection |
| 14 | Health Behavior |
| 14 | Contraception |
| 14 | Blood Transfusion |
| 14 | Base Sequence |
| 14 | Antitubercular Agents |
| 14 | Antimalarials |
| 13 | World Health Organization |
| 13 | Unsafe Sex |
| 13 | Uganda |
| 13 | Tanzania |
| 13 | Sex Education |
| 13 | Risk Assessment |
| 13 | Public Health |
| 13 | Population Characteristics |
| 13 | Mortality |
| 13 | Marriage |
| 13 | Disease Outbreaks |
| 13 | Burkina Faso |
| 13 | Animals |
| 12 | Social Stigma |
| 12 | Rural Health |
| 12 | Reproducibility of Results |
| 12 | Prenatal Care |
| 12 | Prejudice |
| 12 | Peer Group |
| 12 | Longitudinal Studies |
| 12 | Hepatitis B Surface Antigens |
| 12 | Follow-Up Studies |
| 12 | Contraception Behavior |
| 12 | Age Distribution |
| 11 | Sex Distribution |
| 11 | Severity of Illness Index |
| 11 | Population Dynamics |
| 11 | Organizations |
| 11 | Interpersonal Relations |
| 11 | Hepatitis B virus |
| 11 | Health |
| 11 | Genetic Variation |
| 11 | Communicable Diseases |
| 11 | Anemia |
| 11 | Amino Acid Sequence |
| 11 | Africa, Eastern |
| 10 | Zambia |
| 10 | Urban Health |
| 10 | Transients and Migrants |
| 10 | Students |
| 10 | Reproductive Medicine |
| 10 | Regression Analysis |
| 10 | Pilot Projects |
| 10 | Perception |
| 10 | Microbial Sensitivity Tests |
| 10 | Health Promotion |
| 10 | Drug Therapy, Combination |
| 10 | Cost-Benefit Analysis |
| 10 | Blotting, Western |
| 10 | Benzoxazines |
| 10 | Antiviral Agents |
| 10 | Algorithms |
| 10 | African Continental Ancestry Group |
| 9 | United Nations |
| 9 | Syphilis |
| 9 | Safe Sex |
| 9 | Risk |
| 9 | Reverse Transcriptase Inhibitors |
| 9 | Recombination, Genetic |
| 9 | Politics |
| 9 | Medication Adherence |
| 9 | India |
| 9 | Homosexuality, Male |
| 9 | Hepatitis C Antibodies |
| 9 | Double-Blind Method |
| 9 | Diet |
| 9 | Cote d'Ivoire |
| 8 | Women |
| 8 | Viremia |
| 8 | United States |
| 8 | Tenofovir |
| 8 | Survival Analysis |
| 8 | Sex Workers |
| 8 | Reproductive Health Services |
| 8 | Quality of Health Care |
| 8 | Program Development |
| 8 | Molecular Epidemiology |
| 8 | Lamivudine |
| 8 | International Agencies |
| 8 | Health Priorities |
| 8 | HIV Envelope Protein gp120 |
| 8 | Global Health |
| 8 | Financial Management |
| 8 | Evaluation Studies as Topic |
| 8 | Databases, Factual |
| 8 | Communicable Disease Control |
| 8 | Body Mass Index |
| 8 | Biomarkers |
| 8 | Anti-Infective Agents |
| 8 | Anti-Bacterial Agents |
| 8 | Ambulatory Care Facilities |
| 7 | Zimbabwe |
| 7 | Women's Health |
| 7 | Social Class |
| 7 | Senegal |
| 7 | Self Efficacy |
| 7 | Reverse Transcriptase Polymerase Chain Reaction |
| 7 | Primary Health Care |
| 7 | Predictive Value of Tests |
| 7 | Occupational Exposure |
| 7 | Mycobacterium tuberculosis |
| 7 | Motivation |
| 7 | Models, Statistical |
| 7 | Maternal Health Services |
| 7 | Mali |
| 7 | Malawi |
| 7 | Infant Mortality |
| 7 | Hospitals |
| 7 | Hospital Mortality |
| 7 | Histoplasmosis |
| 7 | Herpes Genitalis |
| 7 | Hepacivirus |
| 7 | Hemoglobins |
| 7 | Health Status |
| 7 | Health Services Research |
| 7 | Drug Resistance, Viral |
| 7 | Disease Progression |
| 7 | Developed Countries |
| 7 | Cultural Characteristics |
| 7 | Costs and Cost Analysis |
| 7 | Cluster Analysis |
| 7 | Caregivers |
| 7 | Breast Feeding |
| 7 | Attitude of Health Personnel |
| 7 | Artemisinins |
| 7 | Africa, Northern |
| 6 | Zidovudine |
| 6 | Universities |
| 6 | Simian Immunodeficiency Virus |
| 6 | Sequence Alignment |
| 6 | Sentinel Surveillance |
| 6 | Seasons |
| 6 | Respiratory Tract Infections |
| 6 | Research Design |
| 6 | Quality of Life |
| 6 | Public Policy |
| 6 | Proportional Hazards Models |
| 6 | Pregnancy Complications, Parasitic |
| 6 | Practice Guidelines as Topic |
| 6 | Polymorphism, Single Nucleotide |
| 6 | Polymorphism, Genetic |
| 6 | Phenotype |
| 6 | Patient Compliance |
| 6 | Organophosphonates |
| 6 | Netherlands |
| 6 | Morbidity |
| 6 | Marital Status |
| 6 | Malnutrition |
| 6 | Malaria, Falciparum |
| 6 | Liver |
| 6 | Japan |
| 6 | Infectious Disease Transmission, Patient-to-Professional |
| 6 | Histoplasma |
| 6 | Health Services |
| 6 | Health Care Costs |
| 6 | HIV Seronegativity |
| 6 | Gonorrhea |
| 6 | Food Supply |
| 6 | Employment |
| 6 | Drug Combinations |
| 6 | Diagnosis, Differential |
| 6 | Coitus |
| 6 | Chronic Disease |
| 6 | Blood-Borne Pathogens |
| 6 | Antifungal Agents |
| 6 | Alcohol Drinking |
| 6 | Adenine |
| 6 | Adaptation, Psychological |
| 5 | Vulnerable Populations |
| 5 | Vitamin A |
| 5 | Vitamin A Deficiency |
| 5 | United Kingdom |
| 5 | Tuberculosis, Multidrug-Resistant |
| 5 | Truth Disclosure |
| 5 | Trimethoprim, Sulfamethoxazole Drug Combination |
| 5 | Sputum |
| 5 | Self Report |
| 5 | Schools |
| 5 | Rotavirus Vaccines |
| 5 | Rotavirus Infections |
| 5 | Risk Reduction Behavior |
| 5 | Religion |
| 5 | Prognosis |
| 5 | Pregnancy Complications |
| 5 | Plant Extracts |
| 5 | Placebos |
| 5 | Peptide Fragments |
| 5 | Patient Education as Topic |
| 5 | Outcome Assessment (Health Care) |
| 5 | Nevirapine |
| 5 | National Health Programs |
| 5 | Nasopharynx |
| 5 | Models, Theoretical |
| 5 | Maternal Mortality |
| 5 | Mass Media |
| 5 | Immunoglobulin G |
| 5 | Immunoenzyme Techniques |
| 5 | Hospitals, Rural |
| 5 | History, 20th Century |
| 5 | Herpesvirus 8, Human |
| 5 | Herpesvirus 2, Human |
| 5 | Hepatitis B, Chronic |
| 5 | Health Care Surveys |
| 5 | HTLV-I Infections |
| 5 | HIV Protease |
| 5 | HIV Antigens |
| 5 | Genes, pol |
| 5 | Gender Identity |
| 5 | Gastroenteritis |
| 5 | Disease Transmission, Infectious |
| 5 | Diarrhea |
| 5 | Delivery of Health Care, Integrated |
| 5 | Decision Making |
| 5 | DNA Primers |
| 5 | Cost of Illness |
| 5 | Community Participation |
| 5 | Community Health Services |
| 5 | Cameroon |
| 5 | Brazil |
| 5 | Analysis of Variance |
| 5 | Administration, Oral |
| 4 | Women's Rights |
| 4 | Weight Gain |
| 4 | Voluntary Programs |
| 4 | Vaccines, Attenuated |
| 4 | Treponema pallidum |
| 4 | Travel |
| 4 | Substance-Related Disorders |
| 4 | Stress, Psychological |
| 4 | Smoking |
| 4 | Single Person |
| 4 | Serologic Tests |
| 4 | Sequence Homology, Nucleic Acid |
| 4 | Sequence Homology, Amino Acid |
| 4 | Sepsis |
| 4 | Sampling Studies |
| 4 | Rural Health Services |
| 4 | Reagent Kits, Diagnostic |
| 4 | Radiography, Thoracic |
| 4 | Prisoners |
| 4 | Primary Prevention |
| 4 | Pregnancy in Adolescence |
| 4 | Pregnancy Outcome |
| 4 | Post-Exposure Prophylaxis |
| 4 | Point-of-Care Systems |
| 4 | Parents |
| 4 | Nutritional Status |
| 4 | Nepal |
| 4 | Needs Assessment |
| 4 | Mycobacterium |
| 4 | Mutation |
| 4 | Models, Psychological |
| 4 | Maternal Welfare |
| 4 | Italy |
| 4 | Islam |
| 4 | Intention |
| 4 | Information Services |
| 4 | Influenza, Human |
| 4 | Infant Nutritional Physiological Phenomena |
| 4 | Income |
| 4 | Immunoglobulin M |
| 4 | Human Rights |
| 4 | Host-Pathogen Interactions |
| 4 | History, 21st Century |
| 4 | Herpesviridae Infections |
| 4 | Health Manpower |
| 4 | HIV Reverse Transcriptase |
| 4 | Guideline Adherence |
| 4 | Genetic Predisposition to Disease |
| 4 | Genes, env |
| 4 | Genes, Viral |
| 4 | GB virus C |
| 4 | Financing, Organized |
| 4 | Fear |
| 4 | Far East |
| 4 | Family |
| 4 | Epidemics |
| 4 | Cross-Cultural Comparison |
| 4 | Cooperative Behavior |
| 4 | Community Health Workers |
| 4 | Chlamydia Infections |
| 4 | Child, Orphaned |
| 4 | Child Health Services |
| 4 | Causality |
| 4 | CD4-CD8 Ratio |
| 4 | Blood Banks |
| 4 | Audiovisual Aids |
| 4 | Attitude |
| 4 | Antibodies, Bacterial |
| 4 | Alleles |
| 4 | Acyclovir |
| 4 | Acute Disease |
| 4 | AIDS-Related Complex |
| 3 | Women's Health Services |
| 3 | Vitamins |
| 3 | Viruses |
| 3 | Virus Replication |
| 3 | Viral Proteins |
| 3 | Vagina |
| 3 | Vaccination |
| 3 | Tropical Medicine |
| 3 | Thailand |
| 3 | Syphilis Serodiagnosis |
| 3 | Sulfadoxine |
| 3 | Substance Abuse, Intravenous |
| 3 | Stavudine |
| 3 | Spouses |
| 3 | Software |
| 3 | Social Perception |
| 3 | Social Isolation |
| 3 | Social Behavior |
| 3 | Sexual Abstinence |
| 3 | Self Concept |
| 3 | Reproductive Health |
| 3 | Reproductive Behavior |
| 3 | Reproduction |
| 3 | Religion and Psychology |
| 3 | Refugees |
| 3 | Reference Values |
| 3 | Receptors, CCR5 |
| 3 | Real-Time Polymerase Chain Reaction |
| 3 | Randomized Controlled Trials as Topic |
| 3 | Random Allocation |
| 3 | Pyrimethamine |
| 3 | Public Sector |
| 3 | Psychology |
| 3 | Professional-Patient Relations |
| 3 | Prisons |
| 3 | Primaquine |
| 3 | Prenatal Diagnosis |
| 3 | Practice Patterns, Physicians' |
| 3 | Postpartum Period |
| 3 | Population Control |
| 3 | Pneumonia, Pneumocystis |
| 3 | Plasmodium falciparum |
| 3 | Plants, Medicinal |
| 3 | Physical Examination |
| 3 | Pentamidine |
| 3 | Patient Selection |
| 3 | Patient Admission |
| 3 | Parent-Child Relations |
| 3 | Papillomavirus Infections |
| 3 | Outpatient Clinics, Hospital |
| 3 | Nutritional Requirements |
| 3 | Marketing of Health Services |
| 3 | Lymphocyte Count |
| 3 | Liver Cirrhosis |
| 3 | Infection Control |
| 3 | Immunocompromised Host |
| 3 | Human T-lymphotropic virus 2 |
| 3 | Human T-lymphotropic virus 1 |
| 3 | Hospitals, District |
| 3 | Hepatitis, Viral, Human |
| 3 | Health Status Disparities |
| 3 | Health Resources |
| 3 | Health Planning Guidelines |
| 3 | Health Plan Implementation |
| 3 | Haptoglobins |
| 3 | Haplotypes |
| 3 | HTLV-II Infections |
| 3 | HTLV-I Antibodies |
| 3 | HIV Protease Inhibitors |
| 3 | HIV Long Terminal Repeat |
