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A powerful flu shot that provides extra protection for older people with weaker immune systems is becoming a hot commodity for health-minded seniors. But as a new flu season gets underway, it’s not always easy to find.

Some medical clinics and retail sites offering the Fluzone High-Dose vaccine, approved by the Food and Drug Administration for people over 65, have not yet received shipments they ordered from the manufacturer. The delays stem from the difficulty the World Health Organization encountered this year in identifying the changing strains in the 2019-2020 influenza virus.

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