In reply to  David Roberson's message of Wed, 8 Oct 2014 23:40:42 -0400:
Hi,
>Is it possible that most people have a natural immunity to the virus that 
>prevents them from getting the disease?  Those few that are not immune then 
>would be the ones that have a low survival rate.
> 
>If this were the case, the virus might be capable of spreading by way of the 
>air.  The Spanish lady apparently received a dose of the disease even when 
>covered well with the best protection and little apparent body fluid contact 
>if any at all.
> 
>Has it been established that no one has natural immunity or is that just an 
>assumption?
>
>Dave

If the mortality rate is about 40-60%, doesn't that means that the remainder
have sufficient natural immunity?

Regards,

Robin van Spaandonk

http://rvanspaa.freehostia.com/project.html

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