Expanded STD prevention recommendations and revised gonorrhea treatment regimens are key features in the updated Sexually Transmitted Diseases Treatment Guidelines released in December 2010 by the Centers for Disease Control and Prevention.
Dr. Kimberly A. Workowski, of the division of STD prevention at the National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention, chaired the effort and wrote the guidelines with her colleague, Dr. Stuart Berman, after consulting with numerous experts. The guidelines, last updated in 2006, are available online at www.cdc.gov/std/treatment/2010 or by contacting CDC-INFO at 800-232-4636.
Dr. Kimberly Workowski
Expanded STD prevention recommendations include support for the pre-exposure human papillomavirus (HPV) vaccine, which the report calls "one of the most effective methods for preventing transmission of some STDs." Two vaccines are currently available: the quadrivalent HPV vaccine (Gardasil; Merck), which also prevents genital warts, and the bivalent HPV vaccine (Cervarix; GlaxoSmithKline). Routine vaccination of females aged 11 or 12 years is recommended with either vaccine, as is catch-up vaccination for females aged 13-26 years. More information regarding HPV vaccination can be found at the CDC website.
The guidelines also include revised gonorrhea treatment regimens in the wake of Neisseria gonorrhoeae's decreased susceptibility to cephalosporins and other antimicrobials. In 2007 the CDC recommended that fluoroquinolones not be used for gonorrhea treatment because of resistance to that class of antimicrobials (MMWR 2007;56:332-6).
"What we've been seeing over the past number of decades is change in the N. gonorrhoeae organism in different parts of the world," Dr. Workowski said in an interview. "There have been increasing reports of isolates resistant to cephalosporins from Southeast Asia and from Norway."
Because of these developments, patients who present with an uncomplicated urogenital gonorrheal infection should be treated with a single 250-mg intramuscular injection of ceftriaxone. If this is not an option, consider a single 400-mg tablet of cefixime, or a single-dose cephalosporin regimen. To prevent co-infection with Chlamydia trachomatis, treatment with azithromycin 1 mg orally in a single dose or doxycycline 100 mg twice* a day for 7 days is recommended.
Other changes that differ from the 2006 guidelines include:
• New treatment regimens for genital warts and bacterial vaginosis. The list of patient-applied options for treating external genital warts now includes sinecatechins 15% ointment, a green-tea extract. "We don't know exactly how it works from a scientific standpoint," said Dr. Workowski, who is also an associate professor of medicine at Emory University, Atlanta. "But in published studies it has done well for genital warts, so it's another alternative."
The guidelines recommend applying a 0.5-cm strand of ointment to each wart three times per day until complete clearance of warts. "This product should not be continued for longer than 16 weeks," the recommendations state. "The medication should not be washed off after use. Sexual (i.e., genital, anal, or oral) contact should be avoided while the ointment is on the skin. The most common side effects of sinecatechins 15% are erythema, pruritus/burning, pain, ulceration, edema, induration, and vesicular rash."
The list of alternative regimens for treating bacterial vaginosis now includes tinidazole 2 g orally once daily for 2 days** or tinidazole 1 g orally once daily for 5 days.
• Increasing awareness of lymphogranuloma venereum proctocolitis. Lymphogranuloma venereum is a disease that causes enlarged lymph nodes in the inguinal-femoral area, and it can also cause an infection in the rectum, Dr. Workowski said. Lymphogranuloma venereum proctocolitis can present as rectal bleeding or rectal pain "and is being increasingly recognized in men who have sex with men, particularly in HIV-infected men who have sex with men," she said. "It can also occur in women who engage in receptive rectal intercourse," and should be part of the differential diagnosis in anyone who engages in receptive anal intercourse and presents with a bloody discharge or pain around the rectal area.
• The emergence of azithromycin-resistant Treponema pallidum. Penicillin remains the treatment of choice for syphilis. In those with allergy to penicillin, a 14-day course of doxycycline 100 mg orally twice daily or a 14-day course of tetracycline 500 mg four times daily is recommended. "Azithromycin as a single 2-g oral dose is effective for treating early syphilis," according to the guidelines. "However, T. pallidum chromosomal mutations associated with azithromycin resistance and treatment failures have been documented in several areas in the United States. As such, azithromycin should be used with caution only when treatment with penicillin or doxycycline is not feasible."
• Discussion of the role of Mycoplasma genitalium and trichomoniasis in the evaluation of urethritis and cervicitis and treatment-related implications. While N. gonorrhoeae and C. trachomatis are well established as clinically important infectious causes of urethritis, M. genitalium has also been associated with urethritis. "If clinic-based diagnostic tools (e.g., Gram-stain microscopy, first void urine with microscopy, and leukocyte esterase) are not available, patients should be treated with drug regimens effective against both gonorrhea and chlamydia," the guidelines state. "Further testing to determine the specific etiology is recommended because both chlamydia and gonorrhea are reportable to health departments and a specific diagnosis might improve partner notification and treatment."