<0.1 : Insufficient immunity,booster vaccination recommended 0.1 - 0.5 :Immunity given,booster vaccination will providelong-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.