The original version of this article unfortunately contained a mistake. The Acknowledgement with the members of the Appendicitis- COVID study group is missing. The correct version of is given below. Acknowledgements Members of the Appendicitis-COVID study group: Monza: Marco Nizzardo, Luca Nespoli, Luca Fattori, Luca Degrate, Stefano Perrone, Marco Cereda Bergamo: Michele Pisano, Elia Poiasina, Paolo Bertoli Lodi: Michele Ballabio, Stefano Braga Pavia: Giorgio Graziano Pisa: DarioTartaglia, Francesco Arces Lecco: Marco Mariani, Fulvio Tagliabue Parma: Gennaro Perrone, Alfredo Annicchiarico, Mario Giuffrida Legnano: Giovanni Ferrari, Antonio Benedetti, Niccolò Allievi Ponte San Pietro: Michele Ciocca, Enrico Pinotti, Mauro Montuori San Raffaele: Michele Carlucci, Valentina Tomajer Cesena: Paola Fugazzola The original article has been corrected.