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Figure 1

Figure 1. Past and projected global poliovirus vaccine usage. From: New Generation of Inactivated Poliovirus Vaccines for Universal Immunization After Eradication of Poliomyelitis.

Vertical arrows indicate the years of major changes in vaccine product utilization. Dotted vertical arrows denote estimates of future years of possible changes to come. Horizontal arrows indicate the use of the different IPV and OPV products. The thickness of the horizontal arrows (not to scale) suggests the amount of vaccine utilized during the indicated time period.

Konstantin Chumakov, et al. Clin Infect Dis. ;47(12):1587-1592.

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