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The World Health Organization says the concern about the deadly virus MERS has "significantly increased," with hundreds of people potentially exposed in the U.S. alone. Can officials detect the disease before it's too late and begins to spread to others? CNN's Brian Todd investigates.
CNN's Brian Todd reports on the spread of MERS in the United States.
The World Health Organization is tracking a new deadly coronavirus that has killed 27 people so far. CNN's Mary Snow reports. (Video)
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