WebMD Medical News
Daniel J. DeNoon
Louise Chang, MD
March 12, 2008 -- A raging epidemic of sexually transmitted diseases in
gay/bisexual men drove U.S. syphilis rates up 12% in 2007
-- the seventh consecutive year of syphilis increases.
Meanwhile, a CDC study found that tests for another common STD -- gonorrhea -- miss one in three infections among
men who have sex with men.
Those findings alone are troubling enough. But the picture becomes bleaker
against the background of a surging HIV epidemic.
"This increase in syphilis represents a major concern for the health of
gay and bisexual men," Kevin Fenton, MD, director of the CDC's HIV/AIDS
center, said at a news conference. "STDs increase HIV transmission. And if
a person is already HIV infected, syphilis can increase viral load [a measure
of HIV activity in the body]."
Fenton announced the new STD data at this week's National STD Prevention
Conference in Chicago.
The syphilis numbers are shocking because just a decade ago, the U.S. was on
the verge of eliminating the disease. Now 3.7 out of every 100,000 Americans
-- and 6.4 out of every 100,000
American males -- carry the infection, which can cause blindness, brain
damage, and death if untreated.
Rates among men are six times higher than rates among women. This, Fenton
said, is largely because of huge increases in syphilis infections among
men who have sex with men. About 60% of all recent U.S. syphilis infections
occurred in these men.
African-Americans continue to be disproportionately affected by syphilis.
Syphilis rates are six times higher for African-American men than among white
men, and 13 times higher for African-American women than for white women.
Syphilis and HIV aren't the only diseases spread mainly by unsafe sex.
Gonorrhea is also on the rise. One factor, a CDC study suggests, is that
doctors miss more than one in three gonorrhea infections in HIV negative gay
and bisexual men.
The problem seems to be that doctors aren't testing men who have sex with
men in all three body sites where they are likely to be infected: the penis
(urethra), the rectum, and the throat.
CDC researcher Kristen C. Mahle, MPH, and colleagues found that doctors miss
more than one in three rectal gonorrhea infections, one in four throat
infections, and one in 10 urethral infections in men who have sex with men.
Part of the problem is that the most effective tests for gonorrhea are
nucleic acid amplification tests or NAATs. These tests are FDA approved for
testing for gonorrhea infections in the urethra. But they are not approved for
testing the throat or rectum.
Julius Schachter, PhD, of the University of California, San Francisco,
reported to the conference that NAAT tests work very well in screening men's
throats and rectums for gonorrhea and for chlamydia.
John Douglas, MD, director of the CDC's STD center, said the CDC would work
with the FDA to gain approval of expanded use of NAATs.
"NAATs detect twice as many gonorrhea and chlamydia infections as
bacterial culture tests," Douglas said at the news conference. "FDA
clearance of NAATs would allow for their widespread use in medical
SOURCES:News conference, 2008 National STD Prevention Conference, March 12,
Chicago.Kevin Fenton, MD, director, National Center for HIV/AIDS, Viral Hepatitis,
STD, and TB Prevention, CDC.John Douglas, MD, director, Division of STD Prevention, CDC.Julius Schachter, PhD, University of California, San Francisco.
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