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Age-specific seropositivity for STL polyomavirus (STLPyV) from serum specimens collected in Denver, Colorado, USA (A), and St. Louis, Missouri, USA (B). A total of 500 serum specimens from Denver and 417 from St. Louis were tested for seroreactivity to STLPyV VP1 proteins. Overall seropositivity in Denver was 68% and in St. Louis, 70%. Error bars indicate SD.
