Provision of SQ-LNS also holds promise in incentivizing vaccination as well as other health services. The investigators will estimate 1) the effectiveness of a SQ-LNS mass supplementation program added to routine immunization program compared to routine immunization program alone in terms of measles vaccine coverage, after 12 months of program implementation, 1) in children aged 12-23 months in the end line cross-sectional household survey, 2) in children aged 6-12 months at inclusion, in a longitudinal 12 months follow-up survey. Secondary objectives are to assess the barriers and facilitators from the perspectives of parents/legal guardian of children, health care providers and community health workers and to assess the cost-efficiency of the This study will be implemented in 20 wards covering the Karasuwa and Nguru Local Government Areas (LGAs) in Yobe state, Northeast Nigeria. This is a pragmatic parallel cluster randomized trial (PCT) with baseline measure with different populations and data collection modes: 1) baseline and end line cross-sectional household surveys of children aged 12-23 months, 2) a longitudinal follow-up survey (LS) of children aged 6-12 months at inclusion, 3) a qualitative feasibility and acceptability survey of parents of children aged 6-23 months, of health providers, of community health workers and community representatives and 4) a cost survey of parents/legal guardian of children from the longitudinal follow-up cohort, and 5) a health facility cost survey of a randomized subsample of health facilities. Clusters will be randomly allocated at a ratio of 1:1 either to the standard arm or to the NutriVax arm: * The standard Expanded Program on Immunization (EPI) in children aged 6-23 months delivered according to the Ministry of Health's routine plans in the community and at health centres and health posts, named the standard EPI arm; * The NutriVax program combining the EPI in children aged 6-23 months according to the Ministry of Health's routine plans in the community and at health centres (i.e. PHCCs) and health posts associated with SQ-LNS mass supplementation integrated into pre-existing services delivered at health centres (i.e. PHCCs) for children 6-23 months of age, named the NutriVax arm.
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Measles vaccine coverage in children aged 12-23 months
Timeframe: Measured after one year after of intervention implementation.
Measles vaccine coverage in children 6-12 months at inclusion
Timeframe: Measured after one year after of intervention implementation.