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To the Editor: Since their inception in 1996, National Immunization Days (NIDs) in Myanmar have reportedly provided oral poliovirus vaccine (OPV) to more than 95% of the target population (those younger than 5 years).¹ In conjunction with this, nationwide surveillance for acute flaccid paralysis (AFP) began shortly after the completion of the initial NIDs. In 1999, wild-type poliomyelitis virus was detected for the first time in 4 patients with AFP, aged 8 to 23 months, who lived in a state bordering Bangladesh.^2-3 This might be seen as a sign of improvement in AFP surveillance, which has been a priority in Myanmar, especially in difficult-to-reach parts of the country. However, the overall seroprevalence of poliomyelitis in Myanmar is still unknown.

Methods

We estimated the seroprevalence of poliomyelitis in Yangon, Myanmar, from serum samples obtained between August 1998 and May 1999. Because a randomized serosurvey was not feasible, serum specimens originally drawn for . . . [Full Text of this Article]