Syphilis Becoming Resistant to Oral Antibiotic By Megan Rauscher NEW YORK (Reuters Health) - Some strains of the bacterium that causes syphilis have developed a mutation that makes them resistant to Zithromax (known generically as azithromycin), doctors warn in this week's New England Journal of Medicine "This is important because an increasing number of physicians are azithromycin using for treatment of patients with syphilis and for sexual contacts," Dr. Sheila A. Lukehart, from Harborview Medical Center in Seattle, told Reuters Health. The recommended treatment for syphilis is penicillin, to which there is currently no evidence of resistance. "However, penicillin injections...