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In recent years vaccination campaigns targeting a wide age-range of children have been part of global strategies to eradicate polio and reduce measles mortality. Achieving uniformly high coverage in the target area is critical to reaching herd immunity and disease control goals and real-time monitoring allows rapid targeting of additional activities to areas with inadequate coverage. Yet monitoring coverage during a campaign using administrative data (i.e. dividing the number of individual vaccine doses administered by the target population) is notoriously unreliable with estimates commonly reaching > 100%. Incomplete tallying or reporting of the number of doses administered can bias the results as can poorly documented shifts in population reliance on outdated census data and vaccination of individuals outside the targeted age group or geographic area. Probability-based surveys avoid these problems. However such surveys are often expensive and time-consuming require statistical expertise to plan and do not provide immediate results precluding corrective action during the campaign. (excerpt)

Use and abuse of rapid mnitoring to assess coverage during mass vaccination campaigns