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WHO: Swine flu pandemic has begun, 1st in 41 years

Swine flu is now formally a pandemic, a declaration by U.N. health officials that will speed vaccine production and spur government spending to combat the first global flu epidemic in 41 years. Thursday's announcement by the World Health Organization doesn't mean the virus is any more lethal — only that its spread is considered unstoppable.

Since it was first detected in late April in Mexico and the United States, swine flu has reached 74 countries, infecting nearly 29,000 people. Most who catch the bug have only mild symptoms and don't need medical treatment.

WHO chief Dr. Margaret Chan made the long-awaited declaration after the U.N. agency held an emergency meeting with flu experts and said she was moving to phase 6 — the agency's highest alert level — which means a pandemic is under way.

"The world is moving into the early days of its first influenza pandemic in the 21st century," Chan said in Geneva.