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To assess whether the spread of infection with HIV can be reduced by changes in behaviour among groups most at risk because of their sexual practices sexual behaviour was monitored among 1050 homosexual men tested for HIV infection at a genitourinary medicine clinic in west London from November 1984 to September 1987. Four cohorts, defined by date of… (More)
The Muller F element (4.2 Mb, ~80 protein-coding genes) is an unusual autosome of Drosophila melanogaster; it is mostly heterochromatic with a low recombination rate. To investigate how these properties impact the evolution of repeats and genes, we manually improved the sequence and annotated the genes on the D. erecta, D. mojavensis, and D. grimshawi F… (More)
The prevalence of Gardnerella vaginalis in the urethra of 430 men attending a clinic for sexually transmitted disease was 11·4%; it was significantly higher in heterosexuals (14·5%) than in homosexuals (4·5%). There was no evidence of rectal or subpreputial carriage of G vaginalis, and urethral carriage was not associated with symptoms of urethritis.