STORY 5. CAUSE OF DEATH
CHARLES GIBSON: The CDC is soon going to release new figures based on revised calculations showing that an estimated 4,000 Americans have already died from the virus. That's three times the previous estimate. 40,000 have been hospitalized.
The reason for the higher numbers? Health officials are now counting deaths caused by complications related to the flu. Here's Lisa Stark.
LISA STARK: The new numbers expected from the CDC will be based on a computer model looking at surveillance systems that the CDC uses to track influenza. Systems such as hospitalizations, lab testing and emergency room visits. It does not mean that deaths have gone up sharply. It is just a more accurate snapshot of the toll of the epidemic. The best protection remains the vaccine, and there are still long lines to get it.
PEDESTRIAN (FEMALE): We will be out of vaccine by the time we get to this part of the line.
LISA STARK: Here at Sanofi Pasteur they are working 24 hours a day, seven days a week. This is the only company that is making the H1N1 shot in the United States, and has produced half of the nation's supply so far. Sanofi had promised 20 million doses by the end of October, but delivered only 17 million.
WAYNE PISANO (SANOFI PASTEUR): We assumed 50% of historical yield. Surprisingly, it was actually only 30% when we started. So, the differential was not that great for us and we've been able to close that gap.
LISA STARK: Health officials blame that on the vaccine companies.
KATHLEEN SEBELIUS (SECRETARY OF HEALTH AND HUMAN SERVICES): What we were doing is relying on the manufacturers to give us their numbers. It does appear now that those numbers were overly rosy.
LISA STARK: But at Sanofi, they insist once they realized production was not going as planned, the government was fully informed.
WAYNE PISANO: Had 30 consecutive weeks discussing this with them and we've been able - we've kept them very much informed in terms of what we felt our production schedule could be.
LISA STARK: Sanofi say its production is now at full steam and it will soon be ahead of schedule, but for most of the 159 million Americans at high risk from H1N1, the wait for vaccine continues.
DOCTOR MICHAEL OSTERHOLM (UNIVERSITY OF MINNESOTA SCHOOL OF PUBLIC HEALTH): Unfortunately, the consequences of not having enough vaccine soon enough is we're going to have people who are going to unnecessarily get sick and some will die.
LISA STARK: But Sanofi insists today not for lack of trying, saying it will deliver its promised 75 million doses before the end of the year. And one of the reasons it takes so long to get out vaccine is all the testing. Sanofi says samples from each batch undergo 50 tests, everything from strength to how well the vaccine will work to its purity. Critical tests, but it all takes time. Charlie?
STORY 6. NO TRACE
CHARLES GIBSON: And we got our first look today inside the apartment of Major Nidal Hasan, the only suspect in the shootings. Hasan had given away most of his possessions. He left behind a book on dreams and a bottle of anti-viral drugs.
As for the gun allegedly used in the shooting, officials were unaware he had bought it, even though he had been under government scrutiny. Here's Pierre Thomas.
PIERRE THOMAS: In August, Major Nidal Hasan walked into this Killeen, Texas gun store sources say and legally purchased the gun that police believe was used to massacre soldiers at Fort Hood.
An FBI background check was done when Hasan purchased the pistol, but that information was never shared with a joint terrorism task force which was aware that Hasan had been repeatedly contacting a radical imam suspected of ties to al Qaeda.
BRAD GARRETT (FORMER SPECIAL AGENT): The piece of the information about the gun could be very critical. The gun could actually be the lever to push you forward.
PIERRE THOMAS: In a separate but similar case, a couple of months earlier in Little Rock, Arkansas Abdul Hakim Muhammad was charged with opening fire on an Army recruiting station, killing a soldier. Muhammad was under investigation for possible ties to terrorists. A senior law enforcement official tells ABC News that Muhammad purchased a gun in the weeks before the shooting at a Wal-Mart. An FBI background check was done, but the FBI counterterrorism investigators working Muhammad's case apparently unaware.
RICHARD BEN-VENISTE (9/11 COMMISSION MEMBER): We need to be smarter about sharing information.
PIERRE THOMAS: Senior law enforcement officials say federal law forbids them from widely sharing, even to police, information about legal gun purchases.
RICHARD BEN-VENISTE: It's very disturbing to see, Pierre, that the FBI is precluded from sharing information.
PIERRE THOMAS: The FBI Background Check unit does red flag some gun purchases involving the highest priority terrorism suspects, but that doesn't include everyone the government may have concerns about.
PIERRE THOMAS: Charlie, sources say some law enforcement officials are reviewing ways to close such gaps in information sharing, but they worry that Congress may not have the will to make the changes.
CHARLES GIBSON: Pierre Thomas reporting from Washington.