from your link..."Case of equine influenza reported in Tehama County"
Equine Influenza isnt related to H5N1 fortunately, otherwise, horses as mammals would be posing massive risks to humans as a method for H5N1 to mutate.
We have had several local outbreaks of Equine Influenza here in Australia over the last several years.
Interrestingly, being an Island Nation we are usually insulated from these types of diseases from entering our country.
AQUIS, which is our quarantine facility that oversees the protection from invasion of offshore diseases, pests etc, are very good at what they do, but this one did slip through the screens.
Itd be my guess that it came in via the race horse industry, being the most active to my knowledge, of import/ export of these animals.
Anyway, the real point here is in spite of having excellent protocols and protections here, this new bug snuck through and now it is establishing itself as a part of our environment.
So imagine what would happen if this was H5N1 in a human, what real hope is there for Australia to maintain itself isolated from contamination from the rest of the world.
Even if we could , migrating birds would nullify any efforts anyway.