Personalized Text Messages and Automated Calls for Improving Vaccine Coverage Among Children in Pakistan: Protocol for a Community-Based Cluster Randomized Clinical Trial

Abdul Momin Kazi, Nazia Ahsan, Ayub Khan, Saima Jamal, Hussain Kalimuddin, Naveera Ghulamhussain, Zabin Wajidali, Abdul Muqeet, Fabiha Zaidi, Meraj Subzlani, William McKellin, Asad Ali, Jean-Paul Collet, Abdul Momin Kazi, Nazia Ahsan, Ayub Khan, Saima Jamal, Hussain Kalimuddin, Naveera Ghulamhussain, Zabin Wajidali, Abdul Muqeet, Fabiha Zaidi, Meraj Subzlani, William McKellin, Asad Ali, Jean-Paul Collet

Abstract

Background: A major reason for poor childhood vaccine coverage in developing countries is the lack of awareness among parents and caregivers regarding the need for immunization and the importance of completing the entire series of vaccines. Short message service (SMS)-based interventions have been quite effective in different programs such as smoking cessation, treatment adherence, health care scheduled appointment attendance, antenatal care attendance, and compliance to immunization. However, there are limited data from low- and middle-income countries on the role of SMS and automated call-based messages and interventions to improve routine immunization (RI) coverage.

Objective: The primary objective of this study is to evaluate whether automated mobile phone-based personalized messages (SMS or automated call) can improve RI uptake at 6, 10, and 14 weeks of age per the expanded program immunization schedule, compared with a usual care control group. Secondary objectives include assessing the effects of different types of automated SMS text or calls on RI coverage at 20 weeks of age.

Methods: This is a mixed methods study using a clustered randomized controlled trial with 4 intervention arms and 1 control arm, augmented by qualitative interviews for personalizing the message. The study is being conducted in Pakistan (an urban site in Karachi and a rural site Matiari). In Karachi, 250 administrative structures are taken as 1 cluster, whereas in Matiari, a catchment area of 4 Lady Health Workers is considered as 1 cluster. The intervention targets families to receive weekly 1-way or 2-way (interactive) personalized automated SMS or automated phone call messages regarding vaccination. Possible barriers to vaccination are assessed in each family at the time of inclusion to determine the type of personalized messages that should be sent to the family to increase the chance of a positive response. Finally, in-depth interviews using purposive sampling are conducted before and after the trial to determine the family's vaccination experience and related factors.

Results: All study participants for the cluster randomized trial were enrolled by January 14, 2019. Study exit interviews at 20-weeks follow-up visits will be completed by June 2019.

Conclusions: The results of this study will be useful to understand the respective effects of SMS text messages versus automated phone-based communication to improve RI coverage and timelines. Moreover, information regarding families' perceptions of vaccination and the daily life challenges for timely visits to the vaccine clinic will be used for developing more complex interventions that use mobile phone messages and possibly other approaches to overcome barriers in the uptake of correct and timely immunization practices.

Trial registration: ClinicalTrials.gov NCT03341195; https://ichgcp.net/clinical-trials-registry/NCT03341195 (Archived by WebCite at http://www.webcitation.org/78EWA56Uo).

International registered report identifier (irrid): DERR1-10.2196/12851.

Keywords: SMS messages; automated call messages; cell phones; cluster randomized clinical trial; developing countries; mobile health; parents; personalized intervention; routine immunization; text messaging; vaccination coverage; vaccine barriers.

Conflict of interest statement

Conflicts of Interest: None declared.

©Abdul Momin Kazi, Nazia Ahsan, Ayub Khan, Saima Jamal, Hussain Kalimuddin, Naveera Ghulamhussain, Zabin Wajidali, Abdul Muqeet, Fabiha Zaidi, Meraj Subzlani, William McKellin, Asad Ali, Jean-Paul Collet. Originally published in JMIR Research Protocols (http://www.researchprotocols.org), 30.05.2019.

Figures

Figure 1
Figure 1
Study design: a mixed methods randomized controlled trial (RCT) augmented by qualitative interviews. SMS: short message service.
Figure 2
Figure 2
Catchment area of Karachi pre-urban demographic surveillance site.
Figure 3
Figure 3
The Matiari site: catchment area of surveillance site.
Figure 4
Figure 4
Cluster Randomization.
Figure 5
Figure 5
Sampling strategy for Karachi and Matiari. For 10% effect size, sampling strategy cluster size=15.
Figure 6
Figure 6
Participant flow diagram. HDSS: health demographic surveillance systems; SMS: short message service.
Figure 7
Figure 7
Details of study arm explained.

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