Outbreak of Measles in a Residential Home for the Intellectually Disabled in Singapore in 2019.

Koh, Valerie T J; Chiew, Calvin J; Xiang Ong, Sean Wei; Nandar, Khine; Lee, Anne; Foo, Kelly; Cui, Lin; Ng, Yi Kai et al. · Am J Public Health · 2020

case_series · Level IV

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Abstract

A measles outbreak involving 19 adults in a home for the intellectually disabled occurred in Singapore in 2019. Further investigation, including a serological survey, was conducted. Mass vaccination and infection control measures were implemented, terminating further secondary transmission. Seropositivity among residents aged 40 to 49 years (90.7%; 95% confidence interval = 78.4%, 96.3%) was lower than among the Singapore adult population (<i>P</i> < .001). This sheltered population, like others previously reported in the literature, had lower measles immunity than the general community, possibly because of limited social interaction. Targeted catch-up vaccination for similarly vulnerable populations should be considered.

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