in contrast , age-specific prevalence rates of igg antibodies to varicella-zoster virus ( vzv ) and herpes simplex virus ( hsv ) rose gradually after birth to attain maximal values of only 72 % ( vzv ) and 83 % ( hsv ) in the 15-25 year age group , and the median ages of infection were delayed ( 12.25 years for vzv and 8.2 years for hsv ) .
C0042338
vzv
C0009450
infection