With the start of flu season just over a month away, Island Health says its flu vaccines could be delayed this year.

However, the health authority told CTV News on Wednesday that it still expects their vaccines to arrive in time for the traditional start of flu season in late October.

"The delay will not affect our immunization program," said Island Health spokesperson Cheryl Bloxham.

Last season's influenza vaccine was estimated to be 72 per cent effective against preventing the illness. That was a dramatic improvement over the 20 per cent effectiveness rate measured in 2017, according to researchers.

By age group, the vaccine was found to have a 91 per cent effectiveness rate in children aged one to eight; 71 per cent in those aged nine to 19; 68 per cent on average in adults 20 to 64; and 65 per cent in those 65 and older.

Last flu season, just 38 per cent of Canadian adults got the flu shot, with vaccine uptake varying by age and risk factors for complications, according to the Public Health Agency of Canada.