Shukla N, Poles M (2004). “Hepatitis B virus infection: co-infection with hepatitis C virus, hepatitis D virus, and human immunodeficiency virus”. Clin Liver Dis. 8 (2): 445–60, viii. doi:10.1016/j.cld.2004.02.005. PMID15481349.
Burchell A (2006). “Modeling the Sexual Transmissibility of Human Papillomavirus Infection using Stochastic Computer Simulation and Empirical Data from a Cohort Study of Young Women in Montreal, Canada”. American Journal of Epidemology. 169 (3): 534–543. doi:10.1093/aje/kwj077.
“Sexually transmitted diseases (STDs)?”. PLWHA/National AIDS Resource Center. Bản gốc lưu trữ ngày 26 tháng 12 năm 2018. Truy cập ngày 25 tháng 3 năm 2013., Frequently asked questions (FAQ) About Sexually Transmitted Diseases (STDs), Ethiopian AIDS Resource Center "Sometimes the terms STI and STD are used interchangeably. This can be confusing and not always accurate, so it helps first to understand the difference between infection and disease. Infection simply means that a germ—virus, bacteria, or parasite—that can cause disease or sickness is present inside a person’s body. An infected person does not necessarily have any symptoms or signs that the virus or bacteria is actually hurting his or her body; they do not necessarily feel sick. A disease means that the infection is actually causing the infected person to feel sick, or to notice something is wrong. For this reason, the term STI—which refers to infection with any germ that can cause an STD, even if the infected person has no symptoms—is a much broader term than STD."
Shukla N, Poles M (2004). “Hepatitis B virus infection: co-infection with hepatitis C virus, hepatitis D virus, and human immunodeficiency virus”. Clin Liver Dis. 8 (2): 445–60, viii. doi:10.1016/j.cld.2004.02.005. PMID15481349.
Villhauer, Tanya (ngày 20 tháng 5 năm 2005). “Condoms Preventing HPV?”. University of Iowa Student Health Service/Health Iowa. Bản gốc lưu trữ ngày 14 tháng 3 năm 2010. Truy cập ngày 26 tháng 7 năm 2009.
“Sexually transmitted diseases (STDs)?”. PLWHA/National AIDS Resource Center. Bản gốc lưu trữ ngày 26 tháng 12 năm 2018. Truy cập ngày 25 tháng 3 năm 2013., Frequently asked questions (FAQ) About Sexually Transmitted Diseases (STDs), Ethiopian AIDS Resource Center "Sometimes the terms STI and STD are used interchangeably. This can be confusing and not always accurate, so it helps first to understand the difference between infection and disease. Infection simply means that a germ—virus, bacteria, or parasite—that can cause disease or sickness is present inside a person’s body. An infected person does not necessarily have any symptoms or signs that the virus or bacteria is actually hurting his or her body; they do not necessarily feel sick. A disease means that the infection is actually causing the infected person to feel sick, or to notice something is wrong. For this reason, the term STI—which refers to infection with any germ that can cause an STD, even if the infected person has no symptoms—is a much broader term than STD."
Villhauer, Tanya (ngày 20 tháng 5 năm 2005). “Condoms Preventing HPV?”. University of Iowa Student Health Service/Health Iowa. Bản gốc lưu trữ ngày 14 tháng 3 năm 2010. Truy cập ngày 26 tháng 7 năm 2009.
