A stock-out event is defined when a stock-out of a vaccine occurred for a duration of at least one month at national level. To improve cross-country comparisons, the analysis focused on select vaccines common to all national immunization schedules. These include: BCG, DTP, Measles containing vaccines (ex: DTP-HepB-Hib or MMR) and Polio (ex: OPV or IPV). 43% of Member States reported experiencing a national level stock-out in 2013, for at least one vaccine and for at least one month. Source of data is the WHO-UNICEF joint reporting forms.
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