will return from pig.
It may have 1/3 of pig virus, but pigs can also catch bird flu as
well, just as humans can, but only pigs can produce flu, which allows
human-human transmission. Birds can't.
The fear had been that bird flu will infect pigs, and pigs produce
versions that allow human-human transmissible bird-flu. Note that the
name does not change despite it being DEVELOPED in pigs.
In fact you can say that all flu are SWINE FLU, because only pigs
allow mutations into human-human transmissible form from other
animals, whether bats, (nipah and encephalitis) or birds, as the
current swine flu is. Fortunately Swine flu is only 1/3 bird flu.
Scientists warn of pig pandemic after swine flu moves from human to
By Steve Rennie – 16 hours ago
OTTAWA — German scientists are warning of a pig pandemic after tests
suggested the swine flu can pass from humans to hogs and then infect a
A team of virologists at Germany's national animal health research lab
recently infected five pigs with the human strain of the H1N1 virus
and put the sick pigs in a room with three healthy pigs.
Within four days, all the pigs had the flu. All of them recovered.
A research paper to be published Friday in the Journal of General
Virology warns "the high transmissibility of the virus observed in
humans also applies to pigs."
That increasingly puts pigs at risk as the virus spreads among humans.
"It must be assumed that this virus will spread fast and efficiently
if introduced into swine farms, possibly establishing endemic
infections," the paper says.
"With the increasing numbers of human infections, a spillover of this
virus to pigs is becoming more likely."
There is no evidence pigs are passing the swine flu virus to humans,
or that eating pork products poses an infection risk.
Dr. Thomas Vahlenkamp, who headed the team of virologists at Germany's
Friedrich Loeffler Institute, said the tests show how susceptible pigs
are to the virus.
"We would not claim that the virus can easily be transmitted to pigs,"
"But at least if the pig is infected, it can transmit it quite easily
The Canadian Pork Council says fears of a pig pandemic are overblown
since the animals are kept away from people.
"It's not like ... some of the other animals or livestock that are
just out in a field," spokesman Gary Stordy said.
"Since they are in enclosed structures with ventilation, there's very
minimal contact with unauthorized (people) or the general public.
There's generally very limited access to a farm just because of bio-
This is not the first time researchers have shown pigs can catch the
human strain of the H1N1 virus. British scientists ran similar tests
in May with the same results.
But it's believed the German scientists are the first to publish their
findings in a scientific journal.
The Germans also added a twist to their experiment by throwing five
chickens into the mix to see if the birds would catch the virus from
the sick pigs. But the fowls stayed fit.
Researchers then tried to directly infect the chickens with the virus,
to no avail.
"We don't know whether chicken in general cannot catch the infection,
but at least in our hands with this isolate from a German patient we
could not infect chicken," Vahlenkamp said in an email.
Canada is only one of two places where the pandemic virus has been
found in pigs. The other is Argentina.
In April, swine flu appeared in pigs on an Alberta farm. At first,
health officials thought a farmhand who had been to Mexico and fell
ill upon his return infected the pigs. But blood tests showed the
worker didn't infect the herd.
The farmer who owned the pigs later culled his entire herd when he
couldn't sell the animals.
Two workers at a Saskatchewan hog farm recently caught a brand new
virus, and a third is thought to have been sickened by the same thing.
All three have fully recovered.
Health officials say the new virus is not connected to the current
swine flu pandemic that has infected thousands of Canadians and been
linked to 37 deaths across the country.
The 10,000 to 15,000 hogs on the Saskatchewan farm are all reportedly
That's sure to have drawn a sigh of relief from the farm owner since
it's common to see influenza in pigs, and human transmission to pigs
is known to occur.
The German scientists say experiments are underway to see whether
there are any vaccines available for pigs that might stop the spread
of the swine flu.
Copyright © 2009 The Canadian Press. All rights reserved.