An outbreak of Middle East respiratory syndrome in South Korea has sent sales of surgical masks soaring. When the deadly virus first appeared in the country in May, people started wearing masks just about everywhere - on the metro, at crowded malls and even at weddings - despite the fact that the virus doesn't spread easily outside of hospitals and clinics.
The masks come in a range of colors, patterns and styles. Some are stiff with elastic ear bands. Some are soft and pleated, made of synthetic or natural fibers. And some masks even have built-in respirators. But do these masks work?
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