Hypoplastic Anaemia Treated by Transfusion of Foetal Haemopoietic Cells

ORA temperature and low bicarbonate content of the medium for optimal growth in tissue culture. Twenty-four strains grew only in human-kidney cultures and resembled F.E.B. virus of Salisbury. Seven viruses grew in both human-kidney and monkey-kidney cultures and resem- bled but were not identical to H.G.P. virus of Salisbury. E.C.H.O. 28 virus, as well as these new viruses, was associated with an outbreak of colds in October, 1960. Another outbreak in late January and early February was caused primarily by the respiratory syncytial virus which was isolated from 11 specimens. Para-influenza viruses 1 and 2 appeared sporadically.