contagious(of a disease, easily transmitted to others) adjective [UK: kən.ˈteɪ.dʒəs] [US: kən.ˈteɪ.dʒəs]
infectious(transmitted between persons as illness) adjective [UK: ɪn.ˈfek.ʃəs] [US: ˌɪn.ˈfek.ʃəs]The new coronavirus is very infectious. = El nuevo virus corona es muy infeccioso.