Table 2. Estimation of Total Saved Doses in Surat City in a Year After Introduction of OVP .

Vaccine	OPV	DPT, HBV, and Pentavalent
Vaccine WF before implementation of OVPa (See reference 6)	1.33	1.22
Vaccine WF after implementation of OVPb	1.16	1.09
Estimated vaccine doses consumed in SMC during 2014c	6 785 840	3 516 040
Projected vaccine doses wasted in 2014 if OVP was not implementedd	1 683 705	634 040
Estimated vaccine doses wasted in 2014 after implementation of OVPe	935 978	290 315
Estimated vaccine doses saved due to implementation of OVP	747 727	343 725

Abbreviations: OPV, oral polio vaccine; OVP, open vial policy; HBV, hepatitis B virus; SMC, Surat Municipal Corporation; WR, wastage rate; WF, wastage factor.

^aVaccine WF according to the study done by Mehta et al ⁸ in Surat city during January-March 2012.

^bVaccine WF calculated in this study from the data of January-March 2014. Vaccine WF was calculated by using the formula Vaccine WF = [100/(100-Vaccine WR)].

^cEstimated vaccine doses consumed was calculated from data provided by immunization cell of SMC which include vaccine provided through 40 urban heath centers (UHCs) across the city. Vaccine consumption of April–September 2014 was doubled to estimate the yearly consumption of vaccine doses for all 40 UHCs of SMC.

^dTotal vaccine doses wasted in absence of OVP was calculated by taking the vaccine WF of year 2012. ⁸ Vaccine doses wasted was calculated by the formula ‘Total doses wasted’=Total consumption x [1-(1/vaccine WF)].

^eTotal vaccine doses wasted after implementation of OVP was calculated by taking the vaccine WF of year 2014. Wasted doses were calculated by formula ‘Total doses wasted’ = Total consumption x [1-(1/vaccine WF)].