Federal health officials revise the number of Americans who've likely died from swine flu, saying the figure is four times higher than originally thought. The Center for Disease Control now reports the virus has claimed more than 4,000 lives.

As H1N1 spreads across the nation, health officials are pleading with the public: If you are sick, stay home. But for millions of Americans with no paid sick leave, the choice isn't easy. Can they afford to stay home to nurse the swine flu? "A person has to eat," says waitress Kara Knoche, right.

Across the country, children, pregnant women and people with compromised immune systems are waiting in long lines for H1N1. Meanwhile, some prison inmates are jumping to the head of the line because they are considered high risk. Federal health officials say high-risk people should get the vaccine, no matter where they are. And that's got some people hopping mad.

The supply of H1N1 vaccine is millions short of what was expected by now, and some people have waited in line for hours to get it and gone away empty handed. Health and Human Services Secretary Kathleen Sebelius says, "I know it's frustrating" but that there will eventually be enough vaccine "for everyone."

As the H1N1 virus continues to target children at higher rates than those experienced by the general public, hundreds of schools across the country have closed their doors to combat the spread of so-called "swine flu." So far, more than 100 children have died after falling ill with H1N1.

The Food and Drug Administration approves a new swine flu vaccine. Health and Human Services Secretary Kathleen Sebelius says limited supplies should start arriving in early October, and the bulk of the vaccine will be available Oct. 15. The government has ordered 195 million doses for now but may order more if needed. Typically 100 million Americans seek flu vaccine every year.

Doctors announce that a single shot of the new swine flu vaccine should be strong enough to protect adults. Originally scientists had said that two shots would be necessary for each adult. Now the limited supply of the vaccine will stretch twice as far. Said Dr. Anthony Fauci of the National Institutes of Health: "This is quite good news."