PARIS – Swine flu spreads four times faster than other viruses and 40 percent of the fatalities are young adults in good health, the world’s top health official said in an interview appearing Saturday.

“This virus travels at an unbelievable, almost unheard of speed,” World Health Organisation Director General Margaret Chan told France’s Le Monde daily in an interview.

“In six weeks it travels the same distance that other viruses take six months to cover,” Chan said.

“Sixty percent of the deaths cover those who have underlying health problems,” Chan said. “This means that 40 percent of the fatalities concern young adults — in good health — who die of a viral fever in five to seven days.

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