Question

what is the main difference between an sti and an std?
only stds require medical treatment, while stis do not.
an sti is always less serious than an std because an sti cannot be transmitted.
an std is the presence of sexually transmitted pathogen, and an sti is when an infection causes symptoms
stds are not contagious, but stis can be transmitted from one person to another, often leading to stds if untreated

Explanation:

• Option A: Both STIs and STDs often require medical treatment. So this option is wrong.
• Option B: STIs can be transmitted. For example, chlamydia (an STI) is highly transmissible. And STIs can progress to more serious conditions. So this option is wrong.
• Option C: STD (sexually - transmitted disease) implies the presence of a pathogen and usually symptoms or a defined disease state. STI (sexually - transmitted infection) specifically refers to the presence of an infection (pathogen in the body), which may or may not cause symptoms immediately. This is the correct distinction.
• Option D: STDs are contagious. STIs are also contagious as they are infections. So this option is wrong.

Answer:

C. An STD is the presence of sexually transmitted pathogen, and an STI is when an infection causes symptoms