TORONTO - Another summer camp in Ontario's cottage country has tested positive for the H1N1 virus, bringing the number of children in the area with swine flu symptoms to 275.

The Simcoe-Muskoka Distric Health Unit is now reporting four summer camps have laboratory confirmed cases of H1N1, up from three, with a handful of other camps under investigation for clusters of respiratory illness.

The unit's acting associate medical officer of health says the number of camps being evaluated is constantly changing.

Dr. Na-Koshie Lamptey says just over 16 per cent of campers in the area have been affected, with all cases said to be mild.

The neighbouring Haliburton health unit had one camp under investigation, and a camp in the Ottawa area had reported confirmed cases of the novel strain.

Parents are still being urged to continue to send their children to camp as long as they are healthy.

The Muskoka health unit says it's in close contact with all camps in the area and says it continues to look for new signs of illness.

Lamptey says the new strain of the virus is giving the health unit "an unusual experience" this summer because of the high levels of respiratory illness it is creating.

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Another summer camp in Ontario's cottage country has tested positive for the H1N1 virus, bringing the number of children in the area with swine flu symptoms to 275.

The Simcoe-Muskoka Distric Health Unit is now reporting four summer camps have laboratory confirmed cases of H1N1, up from three, with a handful of other camps under investigation for clusters of respiratory illness.

The unit's acting associate medical officer of health says the number of camps being evaluated is constantly changing.

Dr. Na-Koshie Lamptey says just over 16 per cent of campers in the area have been affected, with all cases said to be mild.

The neighbouring Haliburton health unit had one camp under investigation, and a camp in the Ottawa area had reported confirmed cases of the novel strain.

Parents are still being urged to continue to send their children to camp as long as they are healthy.

The Muskoka health unit says it's in close contact with all camps in the area and says it continues to look for new signs of illness.

Lamptey says the new strain of the virus is giving the health unit "an unusual experience" this summer because of the high levels of respiratory illness it is creating.