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Dr Vanessa Saliba, consultant epidemiologist at the UK Health Security Agency, says the rise in cases in England reflects what is happening abroad - and that's a concern as the summer holiday season gets going.

“I don’t know how long I’ll indefinitely need the oxygen,” Retton said while gesturing toward her nasal tube, “but you have no idea how blessed and how grateful I was for this holiday season.”

Additionally, during the popular May Day holiday season last year, some universities issued strict guidelines for students who had planned to travel.

In short, that will mean long queues at some destinations could continue during this holiday season and perhaps beyond.

Japan is currently in one of its busiest holiday seasons, Golden Week, which consists of four national holidays in seven days, and will see trains, airports and holiday hotspots hit their peak.