Virologists and politicians alike see the frantic parties for Denmark's 2-1 win over the Czech Republic, when tens of thousands of people gathered amid the rise of the more contagious Delta variant, as a cause for concern.

As thousands of Danes stormed the streets with wild parties over their football team's advancement to the European Championship semi-finals by defeating the Czech Republic, virologists and politicians alike have cautioned against allowing a superspreader event in the midst of a pandemic.

For Allan Randrup Thomsen, a professor of experimental virology at the University of Copenhagen, the images of his slap-happy countrymen celebrating their greatest success on the football pitch since their sensational Euro 1992 victory, are a cause for concern.