Fig. 3
From: Long-term time trends in reactivated herpes simplex infections and treatment in Sweden
Anti-HSV IgM positivity in the Betula cohort. The prevalence of anti-HSV IgM at first sampling per sampling day of the year and daily mean UV levels in Umeå, Sweden. The prevalence of anti-HSV IgM antibodies for each day of the year in the Betula cohort, is plotted against daily UV levels (not individual doses) in Umeå. The blood samples in the Betula cohort were drawn between 1988 and 2005, while the mean UV value for each day was calculated as the mean over five consecutive years between 1991 and 1996. The x axis represents January 1 through December 31