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One in five Canadians infected with HIV doesn't know it, so federal scientists are looking for ways to make testing more accessible.

"The behaviours associated with HIV transmission are highly stigmatized, and that can result in individuals in certain populations not wanting to come forward and be tested," says Paul Sandstrom, director of the National HIV and Retrovirology Laboratory in Winnipeg.

"We can't just be sitting back and waiting for a sample to arrive in the laboratory … We've had to come up with new strategies where we can engage the community and individuals within the community — essentially take the laboratory outside of the laboratory."

On World AIDS Day, Dec. 1, the Public Health Agency of Canada (PHAC) says there's a new HIV infection in Canada every three hours.