“…However, immunosuppression also leads to increased susceptibility to infections of many kinds, including primary CMV infections (Bodey, Wertlake, Douglas & Levin, 1965) so that the problem arose of the part played by the two sources of virus, reactivated endogenous virus (Kanich & Craighead, 1966) compared with fresh infection (Craighead, Hanshaw & Carpenter, 1967). The demonstration that the post-perfusion syndrome (Kaariainen, Klemola & Paloheimo, 1966) in openheart surgery patients, not on immunosuppression, was due to CMV increased the likelihood that such CMV infections were exogenous, but even though infective virus in donor blood was demonstrated by Kaariainen et al (1966) and others the relative parts played by reactivation and infection or re-infection continue to be the subject of discussion both in immunosuppressed (Andersen & Spencer, 1969;Armstrong et al 1971) and other patients (Henle et al 1970;Caul et al 1971;Purcell et al 1971).…”