Final answer:
A teenage girl is least likely to contract human immunodeficiency virus (HIV) in a single act of unprotected sex compared to other STIs like HPV, genital herpes, and genital warts. Safe sex practices and vaccination can reduce the risk of transmission, and the use of condoms is an effective preventive measure.
Step-by-step explanation:
Least Likely STI to be Contracted from Unprotected Sex
According to a study conducted by Glei (1999), in a single act of unprotected sex with an infected partner, a teenage girl is least likely to contract human immunodeficiency virus (HIV). This is in comparison to other sexually transmitted infections (STIs) such as genital herpes, genital warts, and human papillomavirus (HPV). While the risk of contracting STIs can be greatly reduced by practicing safe sex behaviors and using contraceptives like condoms, the likelihood of transmission varies among different STIs.
STIs like HPV and genital herpes, caused by HPV and herpes simplex virus (HSV) respectively, are more commonly transmitted compared to HIV, due to higher prevalence rates and the ability of these viruses to be transmitted even in the absence of visible symptoms. HIV, while particularly severe due to its impact on the immune system and potential progression to AIDS, is less frequently transmitted per act of unprotected sex than these other viruses. Vaccines, such as GARDASIL for HPV, can prevent certain STIs and highlight the importance of preventive measures in sexual health education.
It is also important to note that while HIV transmission is less likely in a single act of unprotected sex, the consequences of contracting HIV can be life-altering. All sexually active individuals are encouraged to get regularly tested for STIs, engage in safe sex practices, and consider vaccination where available to reduce overall risks associated with sexual activity.