An article published in the “Journal of Virology” reports the discovery of a new giant virus that was called Medusavirus. A team of researchers discovered it in northern Japan’s hot springs, where it reproduces by infecting amoebae of the species Acanthamoeba castellanii. The peculiarity of Medusavirus is that it results in the formation of cysts in the infected amoebae, which leads to the growth of a protective covering.