| varicella zoster virus in american samoa: seroprevalence and predictive value of varicella disease history in elementary and college students. | the epidemiology of varicella is believed to differ between temperate and tropical countries. we conducted a varicella seroprevalence study in elementary and college students in the us territory of american samoa before introduction of a routine varicella vaccination programme. sera from 515 elementary and 208 college students were tested for the presence of varicella-zoster virus (vzv) igg antibodies. vzv seroprevalence increased with age from 76·0% in the 4-6 years group to 97·7% in those aged ... | 2014 | 23890292 |