But the Pentagon refused to share the seed strain for its program with the civilian program.
Rapid progress is being made on a new seed strain for that shot, and it may be shipped to vaccine makers by the end of May, he said.
All use a technology involving growing the vaccine in fertilized chicken eggs; at most of them, the seed strain grew more slowly than expected.
All use a technology that involves growing the vaccine in a fertilized egg; at most of the companies, the seed strain has grown more slowly than expected.
C.D.C. scientists are working on a "seed strain" for a vaccine matched to the new swine flu, but warned that it would take months before enough doses for all Americans are ready.
The drop was clearly not caused by the swine flu vaccine drive, which has not gone as fast as the authorities had hoped because the vaccine seed strain grew so slowly.
Its seed strain was created, grown and purified in the same slow way as seasonal flu shots, which hundreds of millions of people have had, and rapid clinical trials last month showed the same lack of serious side effects.
Just as relying on only one seed strain leaves agriculture at risk of catastrophic crop failure when new diseases emerge, the global internalisation in recent years of the monistic world view implied by the Washington consensus and neoclassical economics has left world economies exposed to simultaneous infection by the destabilising and unforeseen effects of financial innovation.
It could take only a few more weeks for the WHO and CDC to develop a "seed" strain of the pandemic virus, but experts say producers would then need four to six months before they could create large volumes of vaccine.Could more innovative manufacturing techniques help?
In a press conference, CDC says it's producing a "seed strain" for the production of a pandemic vaccine.
In the summer 1933, Liang Wang returned to China with the BCG seed strain and lab equipment.
