“Portuguese health authorities this week reported a “vertiginous” rise in the prevalence of the delta variant, which accounted for only 4% of cases in May but almost 56% in June. The country is reporting its highest number of daily cases since February”
Almost certainly from when Portugal was put on the U.K. Green-List
The U.K. has very high rates of Delta as there is a large population of ethic Indians living in U.K.
U.K. residents get Green Light to travel to Portugal, guess what, they give Delta to Portugese residents.