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A fast-spreading mutant strain of syphilis has proved resistant to the antibiotic pills that are offered to some patients as an alternative to painful penicillin shots. Since the late 1990s doctors and public-health clinics have been giving azithromycin to some syphilis patients because the long-acting antibiotic pill was highly effective and easy to use. Four pills taken at once were usually enough to cure syphilis. But now researchers at University of Washington in Seattle have found at least 10% of syphilis samples from patients at sexually transmitted disease clinics in four cities had a strain resistant to azithromycin. "That suggests that this mutation is pretty widely distributed geographically," said Sheila A. Lukehart, research professor of infectious diseases. Lukehart studied 114 syphilis samples from Seattle, San Francisco, Baltimore, and Dublin, Ireland, finding 28% were resistant to azithromycin, including 88% of the Dublin samples. The percentage of samples from San Francisco with the mutant strain jumped from 4% in 1999-2002 to 37% in 2003, with the increase taking place largely among gay or bisexual men with multiple partners. Experts say doctors should switch to penicillin or other antibiotics if azithromycin does not work. But some of those antibiotics can cause nausea and other side effects and must be taken for two weeks; some patients do not complete their treatment and are not cured. The findings also show that syphilis patients treated with azithromycin must have follow-up tests to be sure they are cured. After syphilis sores disappear, the disease can silently attack the brain and cause dementia, paralysis, and death. Penicillin has long been the recommended treatment for syphilis. But it must be given in two buttocks injections much more painful than typical shots because a large amount of the solution must be forced into the muscle. Syphilis decreased in the United States through the 1990s, then climbed 19% from 2000 to 2003, to about 7,100 cases, according to the Centers for Disease Control and Prevention. The CDC attributes the spike to a 12-fold rise in cases among gay and bisexual men, many of whom are also infected with HIV. (AP)
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