the covid epidemic in england grew in the two and a half weeks tojune seventh, driven mainly by younger age groups who are not yet vaccinated, according to new data. researchers from imperial college london say the spread of the delta variant contributed to the rise. but there are tentative signs in the latest daily figures that growth may be beginning to slow. katherine da costa has more. every month, thousands of swab tests are sent out as part of the react study looking at prevalence of covid across england. the latest analysis looks at the situation from the end of may to the first week ofjune, involving more than 100,000 volunteers. it found the virus is spreading rapidly, driven by the delta variant, first detected in india. the study shows around one in 670 tested positive for the virus, and rates were highest among young