Northern hemisphere countries have so far ordered more than one billion doses of swine flu vaccine, the World Health Organisation said Tuesday.
This intense demand coupled with production delays could create shortages, forcing governments that are preparing for a second, possibly more deadly, wave of flu in the fall to make hard choices about who to vaccinate first, experts said.
"Pandemic vaccine orders put in by northern hemisphere countries stand at over one billion," WHO spokeswoman Melinda Henry told AFP.
more form AFP