The Smoking Man said:
I think that one problem is that nobody is using the right terms.
H5N1
Bird Flu
SARS
So what are we talking about folks?
Just becasue I have a dead canary on my doorstep doesn't mean I am going to get sick.
As I understand it, H and N refer to particular proteins on the Avian Influenza A virus. The lethal form of avian influenza (bird flu) has the version of H that is called 5, and the version of N that is called 1. So, that strain is called H5N1.
The Canadian birds that appeared healthy and yet had an influenza infection, did not appear to be carrying H5N1, but rather a different influenza.
There are other bird flus, which are of less concern. Presumably there are *lots* of other bird flus. Viral "species" outnumber bacterial species, by boatloads. - to give you an idea of how many viruses we live with on a daily basis.
The virus that caused the Spanish Flu Pandemic of 1918 shares genetic similarity to H5N1 Avian Influenza.
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SARS (Severe Acute Respiratory Syndrome) is also caused by a virus - but a completely different one. In this case, the disease is caused by a Coronavirus (a different viral family, from Flu.)
There have been over 8,000 reported cases of SARS, and 774 fatalities. There have been close to 200 cases in the US alone.
http://www.wadsworth.org/resnres/bios/wentworth.htm
These numbers indicate that SARS is a greater health threat than Bird Flu. Although the mortality is "only" around 10%, it spreads from person to person with fair ease.