(WAND) — Flu cases are on the rise, and we can expect that number to steadily rise as the peak season gets closer.

There is a new mutation called subclade K, but it is not uncommon for the flu virus to change.

Dr. Worlali Nutakor, an emergency room doctor at HSHS St. Mary's, explained how the mutation happens.

"The mutation is when it's antigen variability, it just changes the configuration, at times. It changes and makes the treatment difficult. And at times, it may it may also make the treatment even milder. So it is not as it may not be as severe as we expect," Nutakor said.

The flu shot is the most effective tool to prevent serious illness, no matter the mutation. Nutakor said it is especially important for those who are at risk — children, pregnant women and those with chronic

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