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A DEADLY new respiratory virus called MERS has struck in the Middle East, infecting 49 people, killing 27, and prompting a dire warning fromt he World Health Organisation.

Of the 49 known infections with the MERS-CoV virus, 27 have resulted in death, the organisation said.

The latest deaths were reported in Saudi Arabia.

The Saudi health ministry said Wednesday that three people died from their infections in the country's eastern region.

The virus is "a threat to the entire world," the WHO's general director said Monday.

Doctors say people who have the disease should be isolated for at least 12 days to avoid spreading it.

In the report published online in the journal Lancet, French scientists said the first patient visited Dubai. He is thought to have caught MERS there before passing it onto the second patient, who had no travel history and with whom he shared a room for three days.

Health officials have previously noted MERS can be spread among people if they are in close contact and clusters of the illness have been spotted in countries including Britain, Tunisia and Saudi Arabia. Experts aren't sure how humans are catching the virus but think it may originate in animals like bats or camels.

In a speech on Monday in Geneva, the World Health Organization's Director-General, Dr. Margaret Chan, said her greatest health concern is MERS. She called the ongoing outbreaks "alarm bells" and said the virus "is a threat to the entire world."

French doctors estimated the disease's incubation period to be from 9 to 12 days for the second case, longer than the 7 to 10 days previously reported by others. They said longer quarantines might be necessary to stop the virus' spread and noted people with underlying medical conditions could be at higher risk.

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Killer virus 'threat to world'