H1N1 The Most Common Strain This Flu Season

Oklahoma is one of 13 states considered to have a high widespread flu outbreak, meaning half of the counties in the state have reported cases of the flu. And chances are, those cases are H1N1.

"We're not necessarily seeing a more severe season but we do know the activity level is increasing," said Epidemiologist Laurence Burnsed.

In 2009, the H1N1 Flu strain gave America a shot of inexperience.

"It was unique, it had not been seen before," Burnsed said.

Due to the new strain, Epidemiologist Laurence Burnsed and the Oklahoma State Department of Health even started a new system.

"Knowing there was potential for a pandemic, we began monitoring the hospitalizations of persons of all ages during that season," Burnsed said.

One of those cases would have included Celeste Isler, who once again has the H1N1 strain.

"I was actually diagnosed with that back in 2009," said Patient Celeste Isler.

This season, Celeste is not the only one aching from the H1N1.

"I'm congested, throat, kind of feeling fatigued," Celeste said.

Clinics and hospitals all across the state, such as the Today Clinic, are seeing patients at an increasing rate most diagnosed with H1N1, this year's most predominate strain of the flu in Oklahoma.

"To some people they still have the remembrance of 2009, but to us it's just another virus," said Today Clinic's Brett Cauthen, M.D.

But unlike 2009, 2014 is no pandemic.

"The H1N1 flu strain that is circulating is available in the vaccine," Burnsed said.

Now included in a vaccine that's not too late to get.

"It still can provide you protection for the remainder of the season," Burnsed said.

Oklahoma falls right in line with the rest of America. With the H1N1 strain now the most common strain nationwide, flu season is expected to last till April.