We can calculate the Control Vaccination Number, , for Varicella. Research
has shown that that the vaccine has 99% effectiveness in the first year, and after eight
years the effectiveness drops to 87% [12]. The vaccination coverage for Varicella among
teenagers in 2007 was 75.7% for one dose and 18.8% for the second dose [14]. We have
calculated for various and doses for different vaccine efficiency as shown in
Tables 7 and 8.