It's feared the number of patients with flu in hospital in England could triple before infections peak.
Cases and hospital admissions are continuing to rise sharply.
Next week resident doctors are due to begin their latest five-day strike, but the British Medical Association is polling members to see if they are willing to call it off.
Doctor Salwa Malik is Clinical Lead at two hospitals in south east England (Sussex) - and says managing the situation on the wards is getting worse:
IN: "We are certainly…"
OUT: "...of a problem."
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