. >> pelley: we went to a mall in manassas, virginia, where, after three hours, they vaccinated 550 people, ran out of vaccine, and turned 350 away. last summer, the government said there'd be 120 million doses of vaccine by fall. weeks later, it revised that to 40 million. now, just over 17 million have shipped, 14% of the first estimate. experts agree the government decoded the virus to prepare a vaccine in record time, a real achievement. but then, the project hit snags. the vaccine took longer than expected to produce, and there were shortages of supplies like the sprayer for the flumist version. this is what the country is waiting for. these are the first pictures of h1n1 vaccine being produced in a sprawling, $250 million facility in swiftwater, pennsylvania. like other vaccines, the h1n1 virus is grown in chicken eggs in an updated version of a process that's been around since world war ii. >> sam lee: viruses are unique in that they require a living host to propagate. and the egg provides, essentially, a small self- contained, sterile factory for the production of the vaccine. >> p