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(Click for frequent words.) 81 HIV 77 HIV infected 76 HIV prevalence 75 HIV infections 71 HIV AIDS 69 HIV AIDS prevalence 69 sexually transmitted infections 67 sexually transmitted diseases 67 sexually transmitted infection 67 human immunodeficiency virus 66 STIs 66 gonorrhea 65 HIV AIDS epidemic 65 STDs 64 sexually transmitted infections STIs 64 chlamydial infection 64 AIDS 64 HIV prevention 64 genital herpes 63 AIDS epidemic 63 H.I.V. 63 IDUs 63 antiretroviral therapy ART 63 tuberculosis TB 63 antiretroviral therapy 62 PrEP 62 chlamydia infection 62 syphilis 62 sexually transmitted disease 62 Sexually Transmitted Infections STIs 62 Chlamydia infection 62 genital herpes infections 61 chlamydia infections 61 HIV AIDs 61 Sexually Transmitted Infections STI 61 antiretroviral drugs 61 chlamydia 61 HPV infection 60 HIV Aids prevalence 60 Antiretroviral therapy 60 Sexually transmitted infections 60 antiretroviral treatment 60 receptive anal intercourse 60 hepatitis C infection 60 viral loads 60 intravenous drug 60 MDR TB 60 HIV Aids 60 anti retroviral therapy 60 Male circumcision 60 genital ulcer disease 60 infections 60 HIV Aids epidemic 59 CMV infection 59 Aids epidemic 59 syphilis infections 59 Hepatitis C virus 59 HCV infection 59 antiretrovirals 59 perinatal transmission 59 genital HPV infection 59 infection 59 sexually active 59 tenofovir 59 HBV infection 59 antiretroviral 59 cervical cancer 59 ARV therapy 59 infectious syphilis 58 chronic HCV infection 58 HAART 58 Circumcision reduces 58 antiretroviral ARV therapy 58 Sexually Transmitted Infections 58 SIV infection 58 reinfection 58 hepatitis C virus 58 gonorrhea infections 58 single dose nevirapine 58 serodiscordant couples 58 viral load 58 HIV diagnoses 58 anti retroviral treatment 58 contracting STDs 57 tenofovir gel 57 CD4 counts 57 HPV infections 57 microbicide 57 lifesaving antiretroviral treatment 57 male circumcision 57 pre exposure prophylaxis 57 antiretroviral medications 57 unprotected vaginal 57 HIV AIDS sufferers 57 gonorrhea chlamydia 57 invasive pneumococcal disease 57 disease 57 herpes infection 57 users IDUs 57 Hepatitis B virus 57 iPrEx study 57 virologic failure 56 receiving antiretroviral therapy 56 MDR tuberculosis 56 resistant gonorrhea 56 generalized epidemics 56 MSMs 56 infections STIs 56 seroprevalence 56 antiretrovirals ARVs 56 viral suppression 56 rectal gonorrhea 56 Vaginal gel 56 condom usage 56 co trimoxazole 56 AIDS pandemic 56 hepatitis B virus HBV 56 Kaposi sarcoma 56 invasive cervical cancer 56 ARV treatment 56 chancroid 56 genital ulcers 56 STDS 56 discordant couples 55 malaria 55 falciparum malaria 55 rotavirus diarrhea 55 wart virus 55 heterosexual intercourse 55 seroconversion 55 undetectable viral loads 55 disease progression 55 diarrheal disease 55 HIV seroconversion 55 genital HPV 55 Sexually active 55 CD4 cell 55 UNAIDS 55 syphilis gonorrhea 55 microbicides 55 unintended pregnancy 55 UNAids 55 P. falciparum malaria 55 hepatitis C genotype 55 cervical lesions 55 latent TB 55 antiretroviral ARV treatment 55 uncomplicated malaria 55 venous blood clots 55 HPV 55 latent tuberculosis 54 Sexually Transmitted Diseases 54 Hiv 54 unprotected sex 54 maternal mortality 54 cellulose sulfate 54 artemisinin resistance 54 Hiv Aids 54 hepatitis C 54 NNRTIs 54 sero prevalence 54 unprotected anal sex 54 multidrug resistant 54 superinfection 54 tuberculosis 54 Tuberculosis TB 54 MTCT 54 HIV AIDS pandemic 54 NNRTI resistance 54 hepatitis B infection 54 chronic HBV infection 54 pneumococcal infection 54 Therapy HAART 54 serosorting 54 HIV AIDS prevention 54 CMV disease 54 pneumococcal vaccination 54 TB 54 Human Papilloma Virus 54 hepatitis C infections 54 PMTCT 54 receptive anal sex 54 HIV Aids pandemic 54 raltegravir 54 coinfection 54 TB MDR TB 54 Piot 54 chlamydial infections 54 oropharyngeal cancer 54 acquired immunodeficiency syndrome 54 maternal morbidity 54 wild poliovirus 54 child transmission MTCT 54 teenage pregnancies 54 Aids 54 herpes zoster vaccine 53 CD4 count 53 latent TB infection 53 Acquired Immunodeficiency Syndrome 53 generalized epidemic 53 seropositive 53 anti retroviral drugs 53 HIV AIDS scourge 53 vaginal microbicide 53 AIDS UNAIDS 53 HIV seronegative 53 antiviral therapy 53 Anti retroviral therapy 53 NNRTI 53 placental malaria 53 anal HPV 53 S. aureus infections 53 vulvar cancers 53 LTBI 53 P. vivax malaria 53 Tenofovir gel 53 protease inhibitor PI 53 external genital lesions 53 Chlamydia infections 53 HCV infections 53 genital HPV infections 53 Syphilis 53 latent infection 53 herpes infections 53 microbicide gels 53 postexposure prophylaxis 53 Hib meningitis 53 colorectal cancer 53 bacterial vaginosis 53 Anti retroviral 53 Genital herpes 53 invasive meningococcal disease 53 antiretroviral medication 53 severe rotavirus gastroenteritis 53 virus HBV 53 Tuberculosis 53 sexual transmitted diseases 53 microbicidal gel 53 multidrug resistance 53 HCV 53 protease inhibitors PIs 53 antiretroviral treatments 53 hiv 53 Marburg virus 53 active antiretroviral therapy 53 Teenage pregnancy 53 Colorectal cancer incidence 52 circumcised 52 Aids pandemic 52 Sexually Transmitted Disease 52 Truvada 52 Marburg haemorrhagic fever 52 HBV 52 pneumococcal pneumonia 52 herpes simplex virus 52 anal cancers 52 drug resistant strains 52 Antiretroviral treatment 52 malaria parasites 52 CAPRISA 52 Antiretroviral drugs 52 STD 52 Unaids 52 nevirapine 52 unprotected receptive anal 52 circumcision 52 cervical vulvar 52 Antiretroviral Therapy 52 sulfadoxine pyrimethamine 52 Hib disease 52 virologic suppression 52 Trichomonas vaginalis 52 uninfected 52 AIDs 52 undetectable viral load 52 Chlamydia 52 HIV seroprevalence 52 CD4 52 HIV serostatus 52 sustained virologic response 52 maternal mortality ratio 52 multidrug resistant tuberculosis MDR 52 HCV genotype 1 52 male circumcision reduces 52 Anti retroviral drugs 52 artemisinins 52 Infant mortality rates 52 mutually monogamous relationship 52 cervical vaginal 52 combination antiretroviral therapy 52 de ath 52 PLHIV 52 MRSA infections 52 trichomonas 52 diarrheal infections 52 maternal deaths 52 unprotected anal intercourse 52 immunosuppressed patients 52 drug resistant TB 52 chlamydia gonorrhea syphilis 52 sickle cell disease 51 Ad5 immunity 51 chronically infected 51 genital ulcer 51 shingles herpes zoster 51 VZV 51 abnormal Pap smears 51 Viramune 51 HSV2 51 BCG vaccine 51 HER2 positive breast cancer 51 rectal microbicides 51 immunodeficiency 51 CMV retinitis 51 type 1diabetes 51 TB bacillus 51 lopinavir ritonavir Kaletra 51 mortality 51 hepatitis B 51 preterm births 51 anal cancer 51 BRCA mutations 51 antiretroviral therapies 51 cryptococcal meningitis 51 child transmission PMTCT 51 HPV# 51 uncircumcised males 51 Valcyte 51 uncomplicated falciparum malaria 51 hepatitis C HCV 51 protease inhibitor 51 spontaneous preterm delivery 51 HIV superinfection 51 HCV infected 51 H. pylori infection 51 WNV infection 51 latent tuberculosis infection 51 chronic hepatitis C 51 Marburg outbreak 51 measles 51 rotavirus infection 51 hepatitis C. 51 antiretroviral naive 51 Anal cancer 51 leukemia ALL 51 chronic undernourishment 51 unwanted pregnancies 51 vaginal gel 51 postpartum hemorrhage 51 vivax malaria 51 heterosexually acquired HIV 51 sexually transmitted HPV 51 slow progressors 51 diarrheal diseases 51 TDF FTC 51 Sexually transmitted infections STIs 51 CD4 + cell 51 reproductive tract infections 51 invasive pneumococcal infections 51 mosquito borne disease 51 Circumcising 51 genital lesions 51 invasive breast cancer 51 colorectal cancer CRC 51 antiretroviral ARV medication 51 Users IDUs 51 H. pylori 51 Circumcision 51 CCR5 tropic HIV 51 preterm birth 51 potent antiretroviral therapy 51 bacterial vaginosis BV 51 Hepatitis C 51 pertussis vaccination 51 drug resistant tuberculosis 51 neonatal mortality 51 initiating HAART 51 rotavirus gastroenteritis 50 multidrug resistant MDR TB 50 virological response 50 anti retroviral therapy HAART 50 diarrheal deaths 50 nelfinavir 50 circumcised males 50 maternal mortalities 50 CD4 cells 50 teen pregnancy 50 TB bacilli 50 falciparum 50 ARVs 50 zidovudine AZT 50 Plasmodium falciparum malaria 50 Circumcised men 50 Virus HIV 50 rotavirus 50 life prolonging antiretroviral 50 microbicide gel 50 prostate cancer 50 transmitted heterosexually 50 WNV infections 50 pneumococcal disease 50 pneumococcal infections 50 hepatitis B virus 50 fungal meningitis 50 anovulatory infertility 50 undergone FGM 50 heart disease 50 EBV infection 50 lassa fever 50 BRCA mutation 50 liver cancer 50 meningococcal disease 50 serostatus 50 Aids scourge 50 NTDs 50 lamivudine 50 herpes 50 chronic HBV 50 transcriptase inhibitors NNRTIs 50 Hepatitis B 50 deadly Marburg virus 50 CRBSI 50 precancerous cervical lesions 50 MRSA infection 50 seropositivity 50 transmittable diseases 50 HIVAN 50 resistant TB 50 Human papillomavirus HPV 50 HIV STD 50 chloroquine 50 GBV C 50 CIN3 50 ovarian cancer 50 multidrug resistant strains 50 PLWA 50 Gag polymorphisms 50 basal cell nevus syndrome 50 tipranavir 50 teenage pregnancy 50 schistosomiasis 50 non nucleoside reverse 50 CD4s 50 PLWAs 50 cancerdefine 50 Darkoh 50 anti retroviral therapies 50 ARVs anti retroviral 50 dapsone 50 chronic HCV 50 pulmonary TB 50 recurrent preterm birth 50 acute myelogenous leukemia AML 50 HI Virus 50 virus 50 CHD mortality 50 uncircumcised men 50 unsafe abortions 50 BCG vaccinated 50 iPrEx 50 nosocomial infection 50 ovulatory cycles 50 Hepatitis C infections 50 Human Papilloma Virus HPV 50 hereditary breast cancer 50 breast cancer recurrence 50 NRTI 50 respiratory viral infections 50 vaginal microbicides 50 endometrial cancer 50 malaria endemic regions 50 ShangRing 50 topical microbicide 50 mutated virus 50 pertussis 50 vaginal cancers 50 antiretroviral ARV drugs 50 spermicide nonoxynol 9 50 paternal discrepancy 50 attending antenatal clinics 50 syphilis chlamydia 50 antiretroviral regimen 50 infant mortality 49 chlamydial 49 anti retroviral 49 Gag Pol 49 HPV-#/# 49 contraceptive prevalence 49 HIV AIDS PLWHA 49 cholera 49 nucleoside analogues 49 syphilis outbreaks 49 indinavir 49 NRTIs 49 cardiovascular disease 49 severe hyperbilirubinemia 49 Tuberculosis MDR TB 49 unintended pregnancies 49 nucleoside analogue 49 colorectal cancer incidence 49 XDR tuberculosis 49 Chlamydia trachomatis infection 49 Gonorrhea 49 teen birthrate 49 HPTN 49 nonmelanoma skin cancers 49 liver disease 49 N. gonorrhoeae 49 Ushercell 49 C. difficile infection 49 Pneumocystis carinii pneumonia 49 microbicide trials 49 epidemic 49 FTC TDF 49 Maternal mortality 49 pneumococcal meningitis 49 vaccine preventable diseases 49 aciclovir 49 antibody titer 49 chikungunya virus 49 ART antiretroviral therapy 49 cervical HPV 49 HIV Aids scourge 49 Acquired Immune Deficiency Syndrome 49 Neisseria gonorrhoeae 49 Unplanned pregnancies 49 TB germ 49 pneumococcus 49 folate supplementation 49 Communicable diseases 49 herpes virus 49 seroconverted 49 Sexually transmitted diseases 49 abacavir 49 initiating antiretroviral therapy 49 chronic hepatitis B. 49 pneumococci 49 sexually transmitted 49 neo natal mortality 49 cancers 49 Staphylococcus aureus infections 49 Nonoxynol 9 49 transcriptase inhibitors 49 recurrent VTE 49 Antiretroviral 49 median CD4 49 serogroup C 49 valacyclovir 49 cerebral malaria 49 Hydroxyurea 49 A1c levels 49 malarial infection 49 PCV7 vaccine 49 influenza A/H#N# 49 Aids Epidemic Update 49 Mvusi 49 Human Papillomavirus HPV 49 spontaneous preterm birth 49 recurrent genital herpes 49 colorectal tumors 49 PPTCT 49 cytomegalovirus infection 49 human papillomavirus HPV vaccine 49 preterm delivery 49 nonvaccine 49 Kala azar 49 HBV DNA 49 cardio vascular disease 49 serious pneumococcal infections 49 darunavir 49 candidemia 49 ovarian tumors 49 HIV PLHIV 49 co trimoxazole prophylaxis 49 Microbicide 49 hormone therapy 49 Stomach cancer 49 guinea worm disease 49 paralytic polio 49 Sexually Transmitted Diseases STDs 49 dengue viruses 49 untreated syphilis 49 C. difficile infections 49 SHBG levels 49 lipohypertrophy 49 latently infected 49 Helicobacter pylori H. pylori 49 anti retroviral treatments 49 UNAIDS Executive 49 sexually transmittable diseases 49 Colorectal cancer screening 49 Anti Retroviral Treatment 49 colorectal cancers 49 polio outbreak 49 pre cancerous lesions 49 Antiretrovirals 49 inhibit replication 49 integrase inhibitor 49 penile cancer 49 mosquito borne illness 49 Pap smear screening 49 dengue hemorrhagic fever 49 PTLD 49 BRCA mutation carriers 49 VivaGel TM 49 viral replication 49 abiraterone 49 Viread 49 GUM clinics 49 malarial parasite 49 oral PrEP 48 recurrent ovarian cancer 48 nonoxynol 9 48 UTIs 48 human papillomavirus HPV 48 AFP Google.com 48 entecavir 48 Cervical cancer 48 Acquired Immuno Deficiency Syndrome 48 hepatitis B vaccine 48 ARV drugs 48 Chlamydia trachomatis 48 antiretroviral regimens 48 preventable illnesses 48 prostate cancer CaP 48 HAART regimens 48 multiple gestations 48 atypical hyperplasia 48 risk HPV genotypes 48 HIV TB coinfection 48 Clostridium difficile infections 48 antiretroviral prophylaxis 48 XDR TB 48 Dr. Maria Wawer 48 infectivity 48 gonococcal infections 48 poliovirus 48 virologic response 48 medulloblastoma tumors 48 Plasmodium falciparum 48 Chlamydia gonorrhea 48 HIVAIDS 48 CDAD 48 applied vaginally 48 diseases STDs 48 Human Papillomavirus 48 prevalance 48 MRSA colonization 48 Nevirapine 48 HepC 48 herpes zoster 48 cataract blindness 48 HIV uninfected 48 virologic responses 48 ocular toxicity 48 hantavirus infection 48 cervical intraepithelial neoplasia 48 heterosexual 48 Unintended pregnancy 48 Routine vaccination 48 zidovudine 48 HCV antibody 48 opportunistic infections 48 breast cancers 48 protease inhibitors 48 homosexually active 48 cART 48 nucleotide analog 48 Mofenson 48 NRTI backbone 48 abnormal Pap smear 48 heterosexuals 48 HbF 48 suppressive therapy 48 unwanted teenage pregnancies 48 hepatic fibrosis 48 PLWHA 48 staphylococcal infections 48 malaria parasite 48 melanoma 48 unprotected anal 48 HPV genotypes 48 Influenza vaccination 48 enfuvirtide 48 protease inhibitor mutations 48 tuberculin skin testing 48 opioid substitution 48 post exposure prophylaxis 48 HIV Infection 48 herpes zoster shingles 48 fluoroquinolone resistance 48 efavirenz Sustiva 48 nosocomial infections 48 immunodeficiency virus 48 acute GVHD 48 Hepatitis C. 48 Human Immuno deficiency 48 pandemic influenza virus 48 Recombinant interferon alpha 48 Lassa fever 48 osteoporotic fractures 48 Tenofovir 48 P. falciparum parasites 48 FSWs 48 malignant melanoma 48 sero status 48 CROI 48 serum urate levels 48 Rift Valley Fever RVF 48 unimmunised 48 hormonal contraception 48 azithromycin 48 AIDS Acquired Immune 48 malignancies 48 HPV Human Papillomavirus 48 P. falciparum 48 haemorrhagic fevers 48 Carraguard 48 HIV HCV coinfected 48 gonococcal infection 48 rilpivirine 48 Kathleen Cravero 48 CRKP 48 virological failure 48 HBeAg negative 48 breast cancer 48 HBV infections 48 C diff infection 48 HIV transmission PMTCT 48 lung cancer 48 Opportunistic Infections 48 C difficile infection 48 nonmelanoma skin cancer 48 Unprotected sex 48 testicular germ cell 48 pulmonary tuberculosis 48 cotrimoxazole 48 selenium supplements 48 perinatally infected 48 virologically 48 invasive aspergillosis 48 congenital syphilis 48 BufferGel 48 HIVNET 48 malaria endemic areas 48 T1DM 48 herpes simplex 48 Antiretroviral Therapy ART 48 virginity pledgers 48 urate levels 48 fosamprenavir 48 mutually monogamous 48 trachoma 48 recurrent venous thromboembolism 47 venous thromboembolic events 47 Oral Polio Vaccine OPV 47 heterosexually acquired 47 snail fever 47 antiretroviral drugs ARVs 47 GRNOPC1 cells 47 sulphadoxine pyrimethamine SP 47 sero positive 47 invasive candidiasis 47 unwanted pregnancy 47 blinding trachoma 47 Epstein Barr virus EBV 47 hormonal contraceptives 47 causes genital herpes 47 Human immunodeficiency virus 47 polycystic ovary syndrome PCOS 47 Hepatitis C virus HCV 47 urinary tract infections UTIs 47 blood borne diseases 47 pelvic inflammatory disease 47 unprotected sexual intercourse 47 Candida species 47 recidivism 47 malarial parasites 47 Raltegravir 47 Dr Muraguri 47 HCV genotype 47 baseline CD4 47 coinfected 47 nonvaccine serotypes 47 HPV prevalence 47 latent TB infections 47 reinfected 47 Anti malarial 47 Male infertility 47 Sexually Transmitted Infection 47 C diff infections 47 lipoatrophy 47 pregnancies 47 Testicular cancer 47 ARIs 47 preterm labor 47 Ebola virus infection 47 REYATAZ ® 47 OIs 47 delaying childbirth 47 Opportunistic infections 47 pathogenic viruses 47 postpartum haemorrhage 47 hepatitis C virus HCV 47 Isentress raltegravir 47 MDRTB 47 Dengue virus 47 WHO UNAIDS 47 CD8 responses 47 AH#N# virus 47 Latex condoms 47 de aths 47 HAV infection 47 poliovirus vaccine 47 diabetes 47 hypertension 47 fibrosis progression 47 prescribed statins 47 C. trachomatis 47 MRSA strains 47 nucleotide reverse transcriptase 47 prevalences 47 genital warts 47 investigational integrase inhibitor 47 esophageal adenocarcinoma 47 curability 47 rotavirus infections 47 IRIN PlusNews 47 Falciparum malaria 47 alpha defensins 47 contrast induced nephropathy 47 syphilis sexually transmitted 47 peginterferon 47 endophthalmitis 47 HIV sero 47 Vibrio infections 47 antibody titers 47 chronic HCV genotype 47 grade cervical dysplasia 47 reverse transcriptase enzyme 47 meningococcal immunization 47 AIDS sufferers 47 YPDP 47 HPV types 47 dengue virus 47 retroviral drugs 47 influenza 47 invasive fungal infections 47 condom 47 Vaccination 47 polioviruses 47 A/H#N# virus 47 alcoholic hepatitis 47 dose Nevirapine 47 teenage conceptions 47 LCMV infection 47 NRTI resistance 47 mycobacterial infections 47 HIV1 47 Infection 47 preventing unwanted pregnancies 47 topical microbicides 47 CMV infections 47 Salmonella typhi 47 clade B 47 neutralizing antibodies 47 CA MRSA infections 47 BRCA carriers 47 HPV subtypes 47 CLABSIs 47 Global AIDS Epidemic 47 zidovudine lamivudine 47 abnormal cytology 47 chronic hepatitis B 47 nevirapine Viramune 47 IPV 47 valganciclovir 47 VTEs 47 Screening Assay 47 leprosy 47 kala azar 47 TRALI 47 circumcision reduces 47 CD4 T 47 uninsurance 47 mosquito borne parasite 47 Marburg Virus 47 Aids Epidemic 47 postmenopausal breast cancer 47 meningococcal vaccines 47 HPV vaccination 47 ASD prevalence 47 MMR uptake 47 ARV rollout 47 PREZISTA r 47 Cohort Study MACS 47 nonnucleoside reverse transcriptase inhibitors 47 placenta praevia 47 Aids sufferers 47 ovarian cancers 47 reducing maternal mortality 47 anti retrovirals 47 Merck Isentress 47 saquinavir 47 undetectable viral 47 viremia 47 P. vivax 47 Teenage pregnancies 47 Genital Herpes 47 virological suppression 47 ovulatory infertility 47 systemic scleroderma 46 Anti Retro Viral 46 CD4 + T 46 GeoVax vaccine 46 diabetes mellitus DM 46 chlamydia gonorrhea 46 micronutrient deficiencies 46 alcoholic cirrhosis 46 human papillomaviruses 46 stavudine 46 NCASC 46 perinatally 46 Tuberculosis Malaria 46 childbed fever 46 malnutrition 46 intravenous bisphosphonates 46 serotype #A 46 abnormal mammograms 46 infected 46 P. aeruginosa infections 46 TNBC 46 recurrent UTI 46 bisexual 46 atopic disease 46 SIV infected 46 dengue haemorrhagic fever 46 Viral load 46 ARVS 46 Microbicides 46 atazanavir 46 androgen therapy 46 PPCM 46 Smallpox vaccine 46 BRCA2 mutations 46 Director Peter Piot 46 pharyngeal cancer 46 polio 46 anal lesions 46 urethritis 46 premenstrual syndrome PMS 46 Malnutrition 46 diabetic kidney 46 prediabetes 46 AZT 3TC 46 iodine deficiency 46 MDR strains 46 mOPV1 46 Kaposi Sarcoma 46 Maternal Mortality 46 genital infections 46 D 1mT 46 bivalent oral polio vaccine 46 HbA1C 46 oropharyngeal cancers 46 polysaccharide vaccine 46 dentinal hypersensitivity 46 premature births 46 INTELENCE 46 colon cancer 46 anti TNF 46 prostate cancers 46 genotype 1b 46 ductal cancer 46 Drug resistant tuberculosis 46 HAART regimen 46 Malnourishment 46 RSV infections 46 VUR 46 imatinib resistance 46 varicella vaccine 46 bloodstream infection 46 H pylori 46 antiretroviral naïve 46 sustained virological response 46 arsenicosis 46 uterine cancer 46 Multi Drug Resistant 46 measles vaccinations 46 S. aureus isolates 46 mosquito borne malaria 46 preterm deliveries 46 undernutrition 46 praziquantel 46 colon adenomas 46 Heterosexual transmission 46 treatable diseases 46 Rakai Uganda 46 Retroviruses