For some context about today's *resurgence* in case numbers in the UK, which might, or not, be concerning, the decrease of the prior winter wave below. Some days, cases were down on the day before, others they were up. Trends are best interpreted over multi-day smoothing windows. pic.twitter.com/mIoTObYs64

— Prof Francois Balloux (@BallouxFrancois) July 28, 2021