Covid infections among people aged 20 to 29 are at the highest level on record in all age groups since the start of the pandemic, according to data from Public Health England.
In the week to July 18, the seven-day case rate in this age group was 1154.7 per 100,000 population.
The lowest case rates were among people aged 80 and over, with a seven-day rate of 60.6 per 100,000 population.
Cases have increased in all parts of England with the highest seven-day average in the north-east at 951.7 per 100,000 people, compared with the lowest at 423.1 in the south-east.
Dr Yvonne Doyle, medical director of Public Health England, urged all people in their 20s to come forward for two doses of the vaccine.
“It is vital that we all remain cautious,” she said. “Remember meeting outdoors is safer than indoors, get two doses of the vaccine as soon as you can, isolate yourself if the NHS Test and Trace tells you to and you show symptoms stay home and take a PCR test.
“We all still have a role to play, the Covid-19 has not disappeared.
“Thanks to the vaccine, hospitalizations and deaths are not increasing as fast as previous waves. However, they are increasing and we continue to monitor the data closely. “