Two farm workers in western Canada have become infected with a new flu virus, health officials said on Tuesday, stressing the strain was not related to the H1N1 pandemic.
The two workers, both employees at a hog barn operation in the province of Saskatchewan, have fully recovered. A third case is under investigation.
The new virus contains genes from a seasonal human H1N1 flu strain and a flu virus common in the swine population called triple reassortant H3N2, Saskatchewan chief veterinary officer Greg Douglas said.
The virus is not connected to the H1N1 strain, or swine flu, which has killed more than 400 people worldwide. That strain is believed to have begun in Mexico and has been labeled a pandemic by the WHO.
There are no signs of increased illness in the hog herd, Douglas said.
“This is a human health issue,” he said. “Saskatchewan pork continues to be safe ... This is not a food safety issue at all.”
Concern about the issue of pigs becoming infected with the H1N1 flu has been heightened in Canada since a herd in Alberta became infected in April.
A human worker who had visited Mexico was initially suspected as the source but was later ruled out.
The Saskatchewan farm is not under quarantine, but the owner has agreed not to move the pigs, said Frank Plummer, chief science adviser for the Public Health Agency of Canada.
The virus would likely not have been detected at all if not for heightened influenza testing as a result of the pandemic, Plummer said.
“Any time there’s a new influenza A strain, we have to be concerned about it, but these events occur and are almost always dead ends,” he said.
All workers on the hog farm are being vaccinated. Douglas said he expects the hogs will eventually go to slaughter as they normally would.
The workers have been in Saskatchewan for about one year and had not recently traveled, Saskatchewan chief medical officer Moira McKinnon said.
Plummer said the new virus was likely transmitted from the pigs to the workers, but said the source of transmission of the pandemic H1N1 virus on the Alberta hog farm, which was quarantined in April, was probably human.
More than a dozen countries have banned Canadian hogs or pork since the quarantine.
Canadian Swine Health Board executive director Bob Harding said there is concern that markets could misinterpret the new virus’ connection to swine.
“This is a poorly understood science. It’s changing as we speak, but it’s not a pig thing,” Harding said.
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