The number of cases of influenza in the Windsor region has more than doubled in a week, according to the Windsor-Essex Health Unit.
The medical officer of health for the region, Alan Heimann, said the number of influenza cases jumped from 21 to 51.
Heimann also said the flu appeared to be hitting a younger segment of the population. He said people under the age of 40 represent 75 per cent of the new cases.
Heimann says people as young as six months old and as old as 88 have been infected.
Heimann says nine people have been hospitalized. One death, possibly linked to the flu, is being investigated.
"This may be a peak, but it also may be the start of a significant increase, and that we'll just have to follow," Heimann said.
Heimann encourages people in the region to get a flu shot.
"All of the cases so far have been isolated as the H1N1 strain. This is the strain that appeared in 2009 and caused the epidemic, and we saw that that was hitting the younger age group," Heimann said.