Quote:
Originally Posted by Cloud
viruses jump species all the time. Where do you think we got smallpox and AIDS?
|
Viruses jumping species is rare which is why such viruses are so destructive. HIV had been around for how long before it did something rare? It jumped species.
Immune response for some people has been surprisingly strong because H1N1 or a variant had jumped species previously in the lifetime of so many. Why are so many younger humans at risk? Because H1N1 has not jumped to humans for a very long time. If H1N1 routinely jumped species, then H1N1 would not be newsworthy.
How often does feline leukemia jump to humans? Always according to some here.
Why is H1N1 from human to cat reported in the national news? Because such jumps are not common and newsworthy. This week's jump from human to cat is the first report after almost a year of an H1N1 pandemic.