“…The lack of serological cross-reactivity between the secreted antigens of myxoma and vaccinia viruses militates against any relationship between these antigens and the common NP antigen of poxviruses (Woodroofe & Fenner, 1962) but is otherwise consistent with the limited serological cross-reactivity already demonstrated between the two viruses (Fenner & Ratcliffe, 1965;Alcock, 1981).…”