The Centers for Disease Control and Prevention is warning health officials about a deadly virus that has never been seen in humans.
The coronavirus has infected 14 people and killed eight of them.
Most of the infections happened in the Middle East.
But a man brought it to Britain after he traveled to Pakistan and Saudi Arabia. This confirms that the virus can be transmitted between people.
The CDC says doctors should watch for patients with respiratory problems, within 10 days after leaving the Middle East.
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