As it stands, my understanding is that this is a mild flu that creates fluid in the lungs a few days in. The real danger is that the fluid grows bacteria, so it's important early on the dose with antibiotics so your serum levels are already up when the fluid forms.
The main two worries here are the virus mutating (the Great Influenza of 1918 that killed more people than WW1, and in fact is why the war ended, did this - started mild, jumped to some swine and mutated, came back as a real killer), and that a massive dosing of antibiotics creates a (lot of?) antibiotic resistant bacteria strains that infest your lungs and kill you anyway. Doomsday scenario, both.
This could turn out like the '74 flu scare where some people got super sick and the government froke out and gave 40 million vaccinations only to have nothing come of it. Nobody knows, at all.
This is why it is important to kill anyone who coughs even if this whole swine flu thingy blows over. You never know when the Real Killer is coming. When you're standing over your sick wife with a gun, having some second thoughts, just remember that it's for the greater good and that you were sick of fucking her anyway.