Which of the following is the most widespread sexually transmitted infection (STI) in Canada?

Which of the following is the most widespread sexually transmitted infection (STI) in Canada?

• A. Gonorrhea
• B. Chlamydia
• C. Non-gonococcal urethritis (NGU)
• D. HIV/AIDS

Answer: (B)

Chlamydia is the most widespread STI in Canada because it has the highest number of people infected at any given time and is the most frequently reported by surveillance. A big reason for this is that many infections are asymptomatic, especially in young people, so individuals may not seek testing or treatment. This silent nature allows transmission to continue, pushing prevalence higher over time. In contrast, HIV/AIDS has much lower prevalence thanks to prevention and treatment advances, and gonorrhea, while still important, occurs at lower reported levels than chlamydia. Non-gonococcal urethritis is a syndrome caused by various organisms, including chlamydia, rather than a single infection itself, so it isn’t the measure of widespread infection.

Chlamydia is the most widespread STI in Canada because it has the highest number of people infected at any given time and is the most frequently reported by surveillance. A big reason for this is that many infections are asymptomatic, especially in young people, so individuals may not seek testing or treatment. This silent nature allows transmission to continue, pushing prevalence higher over time. In contrast, HIV/AIDS has much lower prevalence thanks to prevention and treatment advances, and gonorrhea, while still important, occurs at lower reported levels than chlamydia. Non-gonococcal urethritis is a syndrome caused by various organisms, including chlamydia, rather than a single infection itself, so it isn’t the measure of widespread infection.