Supplies of the flu vaccine could see delays in the U.S. according to the American Academy of Pediatrics.

The vaccine manufacturer blames the timing of selecting which strains of flu shot needed to protect against for the 2019-2020 flu season.

Mahoning and Columbiana county health departments have some of the upcoming season's vaccines in stock. Both departments tell 21 News they have received all of their private stock supplies and are just waiting on the Ohio Department of Health to send them a public stock shipment.

They say it's too soon to know if a shortage will happen.

"We have not received a notification that there will be a delay in any of the vaccine that we have ordered," said Erica Horner, Director of Nursing for the Mahoning County District Board of Health.

Horner says Ohio's flu season typically begins in October and can last into May.

Last year, the department vaccinated about 1,700 people against the flu. Horner says the 2018-2019 flu vaccine was about 40-percent effective, which was an improvement from the 2017-2018 flu season when the vaccine was only a little more than 20-percent effective.

The World Health Organization and the CDC monitor flu activity this time of year in the Southern Hemisphere-- primarily Australia.

Right now, the Australian Government's Health Department is reporting lower than average flu activity compared to previous years.

Mahoning, Trumbull, and Columbiana counties are gearing up for vaccine clinics starting in October. 

Summer is almost over, and the CDC recommends getting the flu vaccine by the end of October. Health experts say it takes about two weeks for the body to build up immunity. 

This year's vaccine is expected to protect against three different strains of the flu virus.

Everyone six months and older is recommended to get a flu shot. Young children, pregnant women, and older adults are at a higher risk of flu complications.