TORONTO - Authorities say four more Canadians have died after contracting swine flu.

The deaths bring to 20 the number of people to die across the country after getting the H1N1 virus.

A teenage boy from Ottawa who had underlying chronic health problems is one of two more Ontario residents who have died after getting swine flu.

Lab tests have also confirmed that a 52-year-old woman from eastern Ontario died after contracting the virus, but it wasn't clear what role it may have played in her death.

Officials say the woman also had chronic pre-existing medical conditions.

Health officials in Quebec say two other people in the province have died after getting swine flu but no other details were immediately available.

There have been more than 2,650 confirmed cases of swine flu in Ontario - and more than 5,700 across Canada - but most are considered mild with symptoms very similar to an annual seasonal flu.

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