Right now in human beings, it kills 55 percent of the people it infects. That makes it the most lethal flu we know of that has ever been on planet Earth affecting human beings.
What killed people during the outbreak in 1918 was not a weak immune system. An over-response from their own immune system known at ARDS killed them. They drowned in their own fluid.
At no time in history have we succeeded in making, in a timely fashion, a specific vaccine for more than 260 million people.
People are trying to do the right thing, but nobody knows what the right thing is. Every country feels like they have to do something, and so they order a quick technological fix.
Most Americans think that public health is services for poor people, and since most Americans hate poor people and want all poor people's services destroyed, they hate public health.