The U.K. will open hundreds more vaccination sites in the coming days, including at soccer stadiums and racecourses, as it tries to massively ramp up delivery of booster shots amid a surge in omicron cases.

The move comes after Health Secretary Sajid Javid told Parliament that the new coronavirus strain now accounts for 20% of confirmed COVID-19 cases in England, while the estimated number of daily infections is about 200,000.

Still, the goal of giving a booster to every adult by year-end is unlikely to be met, the Times of London newspaper reported, citing unidentified NHS leaders.