"This is different than in previous years where only one influenza B strain was covered in the adult formulation of vaccine", the health unit said.
"When the flu vaccine is effective it can make a big difference", she says.
No new flu deaths were reported in Oklahoma last week, but 11 so far this season.
Crystal White Shield lost her 6-year-old daughter, Allison Eaglespeaker, to the flu on December 1. People like Gene Hemshrot says he and his wife have gotten the flu shot every year for the past 20.
The girl, who did not get the flu jab either, was admitted to Princess Margaret Hospital on December 26.
During the last week of December, some 4.1 per cent of doctor visits in the US were because of flu-like illnesses, according to the Centers for Disease Control and Prevention's weekly report known as FluView.More news: Kevin Hart May Return as Oscars Host Thanks to Ellen Degeneres
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She adds that many times the season peaks around January and February, so it is not too late to get the flu shot.
The department's Centre for Health Protection had warned of a surge in the rate of infection in the week the city entered the flu season, about a week earlier than a year ago.
Even though flu season is well underway, it's not too late to get the flu vaccine, says Rock. The 2017-2018 season was the deadliest in decades, killing more than 80,000 people.
"I know it's hard not to let your child go to school, or not yourself go to work, but it is important if you've got these symptoms". The drugs work best when started soon after someone gets sick. "There were just a lot more cases", she said. Frequent handwashing and covering coughs and sneezes with a tissue or a sleeve can also reduce the spread of disease.
Wash your hands often and avoid touching your eyes, nose, and mouth. But if you're sick, the CDC recommends that you stay home so you won't infect others.
Getting a flu shot should be at the top of the list for those at high risk for flu, including the elderly and people with heart disease or lung disease and pregnant women.