< 0.1     :  Insufficient immunity . 
0.1 - 0.5 : Immunity given , booster vaccination will provide long-term 
> 0.5- 1.1 :  Sufficient immunity . booster vaccination in 2 to 5 years
>1.1 - 5.0 : Sufficient immunity . booster vaccination in 5 to 10 years
> 5.0  :    Sufficient immunity . booster vaccination in appron 10 years