미국 CDC가 밝힌 2021년 주요 개정사항 편집하기 (부분)

=='''Chlamydia'''==
Chlamydia continues to be the most commonly reported notifiable infectious disease in the U.S., and prevalence rates are highest among sexually active females ages 15-24.<br>

Asymptomatic infection is common, and the CDC continues to recommend at least annual screening of all sexually active females younger than 25 years and all young males who have sex with males based on sexual behavior and anatomic site of exposure. Screening should be considered for sexually active young males in clinical settings serving populations with a high male chlamydial infection prevalence.<br>

The new guidelines recommend doxycycline 100 milligrams (mg) orally twice daily for seven days as first-line chlamydial infection treatment for AYA. For patients with a doxycycline allergy or pregnancy, alternatives include azithromycin 1 gram (g) orally in a single dose or levofloxacin 500 mg orally once daily for seven days.<br>

Studies have shown doxycycline is more efficacious than azithromycin, especially for extragenital sites. If doxycycline non-adherence is a concern, azithromycin is an option. If azithromycin is used, post-treatment evaluation and testing should be considered, especially with rectal infections.<br>