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But the head of Health Canada's national microbiology laboratory in Winnipeg said scientists there have been unable to replicate the CDC's findings working with specimens taken from Canadians who have developed severe acute respiratory syndrome.

"We've been aware of these (CDC) results for a couple days and as yet we've not been able to confirm the results," said scientific director Dr. Frank Plummer.

"Our results were negative for coronaviruses. And we continue to find evidence of human metapneumovirus."

On Friday, Plummer announced his team had found human metapneumovirus, a member of the paramyxovirus family, in specimens from six of eight patients for whom the lab had samples.

Seems to be a difference of opinion.

Very real possibility that both are finding artifacts...