Impact of novel Oral Poliovirus Type 2 vaccination campaigns: A seroprevalence survey in Nigeria, 2022.

For types 1 and 3, a declining trend was observed with increasing age while type 2 demonstrated an increasing trend with age which achieved level of significance ( p = 0.032) between younger and older cohorts.

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The median antibody titers for serotypes 1 and 3 showed a decreasing trend with age, likely attributable to waning immunity over time and/or, a minimal or no exposure to these serotypes beyond infancy, compounded by the absence of significant exposure to bOPV in recent years from SIAs.

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