Your buddy doesn't take into account...

...the phenomenon of "partial immunity". When someone has a "mild case" of the flu, confirmed by testing, it just means that he has been exposed to a strain that was antigenically similar to the present strain and his immune system is responding more efficiently to the present infection.

Conversely, it is theorized that otherwise healthy young people who get severely ill or die from a particular strain of flu have never been exposed to anything similar and their response is sluggish or non-existent for practical purposes.

The immune system is an amazing machine.


Messages In This Thread