asymptomatic primary merkel cell polyomavirus infection among adults. | merkel cell polyomavirus (mcv) is a recently discovered virus that causes 80% of merkel cell carcinomas. we examined data for 564 gay/bisexual male participants >18 years of age in the multicenter aids cohort study in pittsburgh, pennsylvania, usa, and found that 447 (79.3%) were mcv-antibody positive at initial enrollment. of the 117 mcv-seronegative men, 31 subsequently seroconverted over a 4-year follow-up period, corresponding to a 6.6% annual conversion rate. mcv immunoglobulin g levels rem ... | 2011 | 21801612 |