It's the 17th book in the series.
Then this article writer sure did make an interesting mistake in his article.. Traduction :
"In the German version, the villain is not called "Coronavirus", but Caligarius. In the year of publication, Asterix translator Klaus Jöken revealed to the newspaper “Welt” why he decided against the name “Coronavirus” in the 17th Asterix volume: “Coronavirus is a disease. We Germans see illness as something very unappetizing, disgusting. For the French, a virus is more synonymous with something dangerous and common. The German publisher and I wanted a different name … ”"
Article : https://www.nordkurier.de/aus-aller-welt/corona-virus-taucht-in-alten-asterix-comics-auf-0938669903.html