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Production of H1N1 vaccine over the next year will be "substantially less" than the 4.9 billion doses previously forecast but one dose should provide adequate protection, the World Health Organization (WHO) said.

Based on clinical test results from some 25 drugmakers, weekly production of the new vaccine will be less than 94 million doses, WHO spokesman Gregory Hartl said.

"The real figure will be substantially less than 4.9 billion (over the year)," Hartl told reporters.