Less than one-third of people under 65 with long-term health conditions have received the flu vaccine this year. Health authorities express concern as flu cases rise earlier than usual.
The low vaccination uptake leaves millions of vulnerable patients exposed during the early increase in flu infections.
"Fewer than one in three under-65s with a long-term health condition have been vaccinated against flu so far this year," health officials reported.
The UK Health Security Agency urges eligible individuals to get vaccinated to reduce the risks posed by the flu season's early onset.
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