“…The resistance of mice to infection by a particular virus may be a manifestation of lack of a receptor for virus attachment, inappropriate intracellular processing and replication, or failure of virus assembly or release, and may reflect genetically controlled responses (for reviews, see Brinton & Nathanson, 1981;Brinton et al, 1983). Furthermore, lymphokines, such as interferon, influence the replication of numerous viruses (De Maeyer & De Maeyer-Guignard, 1979;Hailer et al, 1981), including a strain of murine coronavirus (Virelizier, 1981).…”