An interesting read on how labs create vaccines for viruses. In this case the article mostly focuses on a facility in Westchester, NY who is working fast on a vaccine for swine flu (H1N1).
"the process involves repeated rounds of injecting the two types of virus into eggs, and sorting and purifying what grows. Each round of virus growth takes about 42 hours. The ultimate goal is to create a uniform seed stock from a single virus, and to produce 80 vials of it, each containing millions of viruses, that will be sent to drug companies, the C.D.C. and the Food and Drug Administration."