With tourists confined at home and Stockholmers avoiding crowds, a guide is trying to boost business with tours of the city's previous pandemics, from the black death to cholera outbreaks.

On a sunny Saturday, Mike Anderson led a group of history buffs on a "Plague Walk" through Stockholm's Old Town, pausing by churches and in the shadows of narrow orange and yellow houses that line the streets to point out how the city was marked by pandemics past.