Britain announced a spike in deaths related to swine flu on Thursday, but as health experts began grappling with worst-case scenarios, difficult questions over the availability of vaccines emerged.
France and Portugal announced major orders for vaccines against the A(H1N1) virus, soon after Latin American countries expressed concern that their poorer region could miss out, despite being worst-hit by the pandemic.
In London the Health Protection Agency said 29 people with the A(H1N1) virus in Britain had so far died, a sharp increase in the death toll, which earlier this week stood at 17.
It also estimated there were 55,000 new cases last week in Britain, the country worst hit by the pandemic in Europe.
The chief medical officer for England, Liam Donaldson, published new projections to help the health service manage the virus, but which he stressed presented the worst-case scenario.
This scenario suggested that the virus could kill up to 65,000 people, while up to nine percent of the workforce could have flu by the end of August, rising to 12 percent over the winter.
Britain has ordered 132 million doses of a flu vaccine: enough for 60 million people.
France announced it had ordered 94 million swine flu vaccine doses, stepping up its efforts to contain what the World Health Organization (WHO) has warned is now an unstoppable pandemic.
Health Minister Roselyne Bachelot said the vaccines -- a one-billion-euro order -- would be delivered between October and January.