Scientists inject a protein of the novel H1N1 virus into the baculovirus, which can multiply quickly in insect cells.

CNN: CDC: U.S. may need 600 million swine flu vaccine doses

The technology involves caterpillar ovary cells, which were isolated 20 years ago, and a virus called baculovirus that infects insects but does not harm humans, Adams said.

CNN: CDC: U.S. may need 600 million swine flu vaccine doses