Royal Mail has had to increase collections from a post box in a popular student area after reports it was so full of Covid test kits no more would fit.
The box is in Ilkeston Road in Nottingham, where tougher lockdown restrictions may be introduced after a "dramatic" rise in cases.
Student Amy Collins said seeing it brought home the scale of the problem.
Royal Mail said the post box had received "larger than usual volumes".
Ms Collins, a sport rehabilitation student who spotted the full post box on Monday, said: "Seeing a whole post box with nothing but test kits is quite unnerving."
"It makes you realised how many potential contaminated people there are," she added.
The city's infection rate - 440.1 per 100,000 - is the fifth highest in England. There have been 1,465 cases in the week up to 3 October, up from 237 the week before.
The government is expected to introduce new restrictions but Nottingham City Council has already urged people to avoid mixing households.
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