herd immunity.

This is the same logic that leads to measles parties.

pandemic bonds

Sounds like people took a gamble and lost. Its not like the WHO changed their definition of a pandemic, and its not even labled as a pandemic atm. Though it probably will, and should be labled one soon.

sars

Blown out of proportion or caught in time? Sars has a death rate of almost 10%. Thats pretty serious.

swine flu

As many as is the emphasized part of their quote. That means up to. In the first year swine flu infected between 700 million to 1.4 billion people.

Sounds to me like the WHO was right on that one.

swine flu deaths

8,000 to 17,000 in the US alone during the first year. Including almost 300 children.

coronavirus dies at 80°f

The world would love a source on this. I can't find anything on this except people hoping.

size or virus, any mask works.

Would also like a source on this.