Hospital managers in the South East have said the number of hospital admissions due to flu is still rising across the region.
NHS England said the area remains on alert, with the outbreak coinciding with industrial action by resident doctors.
It said last week 2,144 patients were admitted, compared to 1,779 for the same week in 2024, a 20% increase, with a rise of 728 on last week.
Nationally the NHS said the rate of infections appears to be levelling off.