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The Quebec man, 60, was given the flu antiviral after his son fell ill with the pandemic virus. It's believed the resistance arose in the man and there is no evidence he transmitted resistant virus to anyone else.
"It appears to be an isolated case," said Jirina Vlk, spokesperson for the Public Health Agency of Canada.
"Although the strain does not appear to have spread beyond the reported individual case we continue to be vigilant on this front."
Use of Tamiflu to prevent infection - a procedure called prophylaxis - has been seen on occasion to give rise to resistant viruses.
The vaccine remains a more viable choice for controlling the spread of an influenza outbreak.
La Jolla - A strain of H1N flu that is resistant to treatment with the drug Tamiflu has been discovered near the US-Mexican border, the Pan-American Health Organisation (Paho) said on Monday. "We have found resistance to Tamiflu on the border. We have observed some cases, few to be sure, in El Paso and close to McAllen, Texas," said Maria Teresa Cerqueira, head of the local PAHO office.
Originally posted by casualburger
Tamiflu and the vaccine are not the same thing. Becoming resistant to Tamiflu likely will not effect the efficacy of the vaccine as they work by different mechanisms. The drug Tamiflu will quickly become ineffective against the virus while the vaccine will work regardless.