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WASHINGTON (AP) — The flu forecast is cloudy and it’s too soon to know if the U.S. is in for a third miserable season in a row, but health officials said Thursday not to delay vaccination.

While the vaccine didn’t offer much protection the past two years, specialists have fine-tuned the recipe in hopes it will better counter a nasty strain this time around.

“Getting vaccinated is going to be the best way to prevent whatever happens,” Dr. Daniel Jernigan, flu chief at the Centers for Disease Control and Prevention, told the Associated Press.

Last year’s flu brought double trouble: A new strain started a second wave of illnesses just as the first was winding down, making for one of the longest influenza seasons on record. The year before that marked flu’s highest death toll in recent decades.

So far, it doesn’t look like the flu season is getting an early start, Jernigan said. The CDC urges people to get their flu vaccine by the end of October. Typically flu starts widely circulating in November or December, and peaks by February.

Scientists are hunting for better flu vaccines, and the Trump administration last week urged a renewed effort to modernize production. Most of today’s vaccine is produced by growing flu virus in chicken eggs, a 70-year-old technology with some flaws. It takes too long to brew new doses if a surprise strain pops up. And intriguingly, newer production techniques just might boost effectiveness.

For now, people who get vaccinated and still get sick can expect a milder illness — and a lower risk of pneumonia, hospitalization or death, stressed Dr. William Schaffner of Vanderbilt University and the National Foundation for Infectious Diseases.

He’s been known to tell such patients, “I’m always glad to see you’re still here to complain.”

Here are some things to know:

WHO NEEDS VACCINE?

Everybody, starting at 6 months of age, according to the CDC.

Flu is most dangerous for people over age 65, young children, pregnant women and people with certain health conditions such as heart disease, asthma or other lung disorders, even diabetes.

But it can kill even the young and otherwise healthy. On average, the CDC says flu kills about 24,000 Americans each year.

HOW MANY GET VACCINATED?

Not enough, the CDC says. Because flu mutates rapidly, a new vaccine is needed every year. Last year, 45% of adults and 63% of children got vaccinated, according to figures released Thursday.

Some groups do a little better. Nearly three-quarters of children under age 5 were vaccinated last year, and just over two-thirds of seniors.

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