A simple method is presented for producing large numbers of inclusions of Chlamydia trachomatis serotype L2 in cell cultures on slides for immunofluorescence antibody staining. Preliminary results with a total of 1,241 human sera from different groups were consistent with findings by earlier methods: 82% of chlamydia-positive men with nongonococcal urethritis had antibodies at titers of greater...

explain the nature of cell differentiation, going back to Weissman's theory of selective loss of hereditary determinants, and brings us up to date with the latest views on differential genetic programming. He argues persuasively that cloning of embryonic and adult cells is an appropriate assay system for determining totipotency, genetic equivalency, and reversibility of differentiation in nucle...

We report significant failure rates (28%, 95% confidence interval 15%-45%) after administering 1 g azithromycin to men with Mycoplasma genitalium-positive nongonococcal urethritis. In vitro evidence supported reduced susceptibility of M. genitalium to macrolides. Moxifloxacin administration resulted in rapid symptom resolution and eradication of infection in all cases. These findings have impli...