Bulletin of the World Health Organization

Monitoring polio supplementary immunization activities using an automated short text messaging system in Karachi, Pakistan

AM Kazi, A Murtaza, S Khoja, AK Zaidi & SA Ali

Volume 92, Number 3, March 2014, 220-225

Table 1. Vaccine coverages estimated by three methods, Karachi, Pakistan, 2012–2013

Study areas and date of SIA na Estimated vaccine coverage,b % (95% CI)
SMS LQASc PCd
SITEe
March 2012 9/–/135 78 (51–100) ND 93 (89–97)
April 2012 21/–/81 95 (86–100) ND 93 (87–99)
June 2012 22/150/96 91 (79–100) 92 (88–96) 83 (75–91)
July 2012 24/–/87 83 (68–98) ND 90 (84–96)
September 2012 77/–/61 29 (15–43) ND 56 (44–68)
October 2012 37/50/68 86 (75–97) 82 (71–93) 82 (73–91)
April 2013 20/–/75 65 (44–85) ND 56 (45–67)
Baldia
March 2012 8/150/138 63 (30–96) 93 (89–97) 93 (89–97)
April 2012 14/200/77 93 (80–100) 92 (88–96) 96 (92–100)
June 2012 14/150/85 86 (68–100) 94 (92–98) 87 (80–94)
July 2012 18/–/69 94 (83–100) ND 91 (84–98)
September 2012 33/–/66 73 (58–88) ND 82 (73–91)
October 2012 31/50/75 97 (91–100) 88 (79–97) 88 (81–95)
April 2013 29/–/73 52 (34–70) ND 56 (45–68)
Gulshan-e-Iqbal
March 2012 15/100/108 60 (51–69) 91 (85–97) 80 (72–88)
April 2012 22/200/92 68 (49–87) 89 (84–93) 83 (75–91)
June 2012 38/150/77 82 (70–94) 89 (84–93) 81 (72–90)
July 2012 32/–/82 78 (64–92) ND 82 (74–90)
September 2012 46/–/51 61 (48–74) ND 76 (64–88)
October 2012 57/50/68 60 (47–73) 92 (84–100) 84 (75–93)
April 2013 32/–/73 72 (56–88) ND 66 (55–77)
Entire city of Karachi
March 2012 –/–/142 8 (0–21) ND 77 (70–84)
April 2012 24/–/84 92 (81–100) ND 89 (83–96)
June 2012 26/–/83 46 (27–65) ND 72 (62–82)
July 2012 35/–/82 86 (75–98) ND 89 (82–96)
September 2012 53/–/71 26 (14–38) ND 49 (37–60)
October 2012 43/–/72 84 (73–95) ND 85 (76–93)
April 2013 –/–/– ND ND ND

CI, confidence interval; LQAS, lot quality assurance sampling; ND, not determined; PC, phone calls; SIA, supplementary immunization activity; SMS, short message service.

a Numbers of households investigated using the SMS system/LQAS/PC that provided adequate data. We excluded the households of caregivers who claimed not to know if the eligible children in their care had been vaccinated.

b Estimated percentage of children younger than 5 years who received oral polio vaccine in each immunization activity.

c Data collected by the World Health Organization.14

d Data collected in phone calls to the caregivers who did not respond to SMS messages.

e Sindh Industrial and Trading Estate.