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All 21 close contacts of a recent Korean MERS case are asymptomatic, the agency says.
Also, Saudi authorities reported four more cases in a steadily growing Riyadh outbreak.
Multiple hospital visits could be fueling the spread, and early genetic tests show no worrisome signs.
Many of the newest cases represent third-tier illnesses detected at additional hospitals. Korea has named 24 involved hospitals.
The WHO said little is known about virus spread in the outbreak but noted transmission is more common in health settings.
South Korea has 2 more MERS cases—5 total—and Saudi Arabia reports 4 new infections.
MERS has reached South Korea for the first time, and the UAE has identified 2 asymptomatic cases.
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