Vaccine Requirement Calculation

Vaccine requirement is calculated as follows:
  • Total number of pregnant women/infants to be covered × Expected coverage × Number of doses of the vaccine ×Wastage multiplication factor ÷ No. of sessions to be held (or number of doses per vial).
  • No. of pregnant women = Population × Birth rate.
  • No. of infants = Population × Birth Rate × (1-IMR)
  • For Monthly Requirement, divide annual dose by 12.
  • If sessions are held fortnightly, the annual required dose is divided by 24 and if weekly, divide by 52.
  • Expected vaccine coverage=100%=1
Vaccine
Dose up to 1 year
Doses/Vial
Wastage factor
TT for pregnant women
2 doses per women
10 doses/vial
1.33
BCG
1 dose per child (at birth)
10 doses/vial
2
OPV
4 dose per child (0,1,2,3)
20 doses/vial
1.33
Pentavalent
3 dose per child (1,2,3)
10 doses/vial
1.33
DPT
3 dose per child (1,2,3)
10 doses/vial
1.33
Measles
1 dose per child (at 9 month)
5 doses/vial
2
  • For example: If the population of an area is 50,000, the birth rate being 30/1000 and infant mortality rate is 100/1000 live births, the expected number of pregnant women and infants will be:

    No. of pregnant women = Population × BR = 50000*30/1000 = 1500
    No. of infants at 1 year of age = Population × BR × (1-IMR) = 1500*(1-100/1000) = 1500*0.9 = 1350
    Requirement of tetanus toxoid = 1500(pregnant woman) x 2(dose) x 1(100% coverage) x 1.33 (Wastage Factor) = 4000 doses (Annual Requirement).
    Monthly requirement = 4000/12 = 333 doses
    Number of vials =333/10 = 34 vials (because each vial contains 10 doses)

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