There has been a "worrying" surge in coronavirus cases across England but infection rates among young children are falling, new official data shows.
According to the latest weekly surveillance report from Public Health England, Covid-19 case rates are continuing to rise in all regions of England.
Rates remain highest among 30 to 39-year-olds, Public Health England said.
The rate in this age group stood at 557.5 cases per 100,000 people in the seven days to December 27, up week-on-week from 495.4.
Among 20 to 29-year-olds, the rate rose from 498.6 to 539.5, and for 40 to 49-year-olds it rose from 465.9 to 527.3.
Rates fell slightly among five to nine-year-olds, 10 to 19-year-olds and people aged 80 and over.
The lowest rates were recorded among those aged four and under (150.6) and five to nine (167.2).
London's rate of new cases stood at 735.5 per 100,000 people in the seven days to December 27, up from 711.9 in the previous week.
Eastern England saw the second highest rate (551.3, up from 510.8) followed by south-east England (450.6, up from 427.4).
Yorkshire & the Humber had the lowest rate: 188.3, up from 172.4.
Responding to the latest surveillance report figures, Public Health England medical director Dr Yvonne Doyle said: "The Christmas week saw a worrying rise in cases across every region of the country, particularly among adults in their 20s and 30s.
"We must not now add further fuel to the fire, as meeting in close and large groups this New Year's Eve risks further transmission.
"The way we can beat this virus remains the same, whatever the variant.
"Reduce close contact with others and follow the guidance. Wash your hands, wear a mask and keep your distance."
