Robinson in 1969 suggested a term, but its definition was only provided through comparison with horizontal resistance. This term can be understood as pathogenicity that is potent against all types of hosts, or as pathogenicity that is expressed without any differences in interactions between various races and types of the host, vertical pathogenicity. However, this term is only applicable to the characteristic of a specific genus or species. It is not advisable to use this term because the implications of horizontal resistance are too far removed from the biological context to which it pertains.