Flu season is off to the earliest start in a decade in some parts of the US.

Doctors on both sides of the border are reporting an up-tick in cases, with most cases in Canada originating in Ontario, Quebec and BC.

The increase in infections is thanks to a particularly aggressive form the flu bug known as H3N2.

While the virus has proven to be particularly aggressive, NEWSTALK 1010 medical expert Dr. Mitch Shulman says the good news is that the flu vaccine is one step ahead and protects from H3N2. 

Dr. Shulman adds that anti-viral treatments for H3N2 (for those who have not had the vaccine) also seem to be very effective, indicating that the virus is not very resistant.

Dr. Shulman says that while all flu is potentially dangerous, this year's strain is no more hazardous than others and says that prevention is relatively simple. 

He insists the best defense is always to get the flu shot.

Taking simple steps like washing your hands regularly, avoiding people who are sick, getting rest and eating a balanced diet are the best ways to make sure you don't catch the flu this season.