Flu vaccine manufacturers say they could make hundreds of millions of bird flu shots for humans

Some of the world's leading makers of flu vaccines say they could make hundreds of millions of bird flu shots for humans within a few months if a new strain of avian influenza ever jumps across the species divide.

One current outbreak of avian flu is known as H 5 N 1 clade 2.3. 4.4 b has killed a record number of birds and infected mammals. Human cases are very rare, and global health officials have said the risk of transmission between humans is still low.

Executives at three vaccine manufacturers - GSK, Moderna and CSL Seqirus -- said they are about to test sample human vaccines that match the circulating subtype, as a precautionary measure against a future pandemic.

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