Cystic and alveolar echinococcosis are two completely different diseases caused by two different species of Echinococcus parasites. comment ON: Disseminated cystic echinococcosis of Ferdinando II de' Medici, Grand Duke of Tuscany (1610–1670) by Gaeta R, Giuffra V. J infect. 2019 Sep 4. Issue 1 (January 2020)