Lecture: Understanding Sexually
Transmitted Diseases (STDs)
1. Introduction
Definition: STDs (Sexually Transmitted Diseases), also known as STIs (Sexually
Transmitted Infections), are infections that are primarily spread through sexual contact.
Why It Matters: STDs can cause serious health problems if left untreated, and many are
preventable and treatable.
2. Common Types of STDs
A. Bacterial STDs (often curable with antibiotics)
Chlamydia
Gonorrhea
Syphilis
B. Viral STDs (manageable but not curable)
HIV/AIDS
Herpes Simplex Virus (HSV)
Human Papillomavirus (HPV)
Hepatitis B and C
C. Parasitic STDs
Trichomoniasis
Pubic lice ("crabs")
Scabies
3. Transmission
Sexual contact: vaginal, anal, or oral sex
Non-sexual transmission: blood transfusion, sharing needles, mother-to-child during
childbirth or breastfeeding (especially with HIV or syphilis)
