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Pediatrics
Epidemiology & Population Health
Medicine
Surgery
Pathology
Family and Social Medicine
Emergency Medicine
Microbiology & Immunology
Obstetrics & Gynecology and Women's Health
Genetics
Papillomavirus Infections
HTLV-I Infections
HIV Infections
Tumor Virus Infections
Hepatitis C
Hepatitis B
Uterine Cervical Neoplasms
Cervical Intraepithelial Neoplasia
Herpesviridae Infections
Bunyaviridae Infections
Flavivirus Infections
Togaviridae Infections
Sarcoma, Kaposi
HTLV-II Infections
Antibodies, Viral
HTLV-I Antibodies
HIV Antibodies
DNA, Viral
Hepatitis Antibodies
Hepatitis C Antibodies
HTLV-II Antibodies
Hepatitis B Antibodies
Heroin
Antibodies
Substance Abuse, Intravenous
Risk-Taking
Sexual Behavior
Papillomaviridae
Human papillomavirus 16
HIV
Alphapapillomavirus
Human T-lymphotropic virus 1
Sexual Partners
Human papillomavirus 18
Drug Users
Herpesvirus 8, Human
Virion
Human bocavirus
Bocavirus
Hepacivirus
Togaviridae
Felidae
Animals, Wild
HIV Seroprevalence
Enzyme-Linked Immunosorbent Assay
HIV Seropositivity
HIV Seronegativity
Costa Rica
Cohort Studies
Logistic Models