USMLE Step 2 CK High-Yield Practice Test

Oral contraceptives and barrier methods, like condoms, provide significant protection against pelvic inflammatory disease (PID) due to their ability to reduce the risk of sexually transmitted infections (STIs) that can lead to PID. Oral contraceptives work by suppressing ovulation, creating a less favorable environment for the transmission of infections, while barrier methods physically block the entry of pathogens into the reproductive tract.

In contrast, some methods, such as intrauterine devices (IUDs), do not offer the same level of STI protection, and while they can be safe when placed in non-infected individuals, they pose a risk if an infection is present during insertion. Natural family planning does not protect against STIs, making it ineffective in preventing PID.

Thus, the combination of oral contraceptives and barrier methods is beneficial in not only preventing pregnancy but also in reducing the incidence of PID through the reduction in STI transmission.