A most sensitive method has been developed for the detection of Epstein-Barr ( EB ) virus in throat washings.Cryopreserved preparations of foetal cord blood lymphocytes, from samples already found to be optimally sensitive to virus-induced transformation in vitro, were exposed to concentrates prepared from throat washings by ultracentrifugation, the cells were then cultured for 8 weeks to observe the incidence of EB virus-induced transformation to lymp-hoblastoid cell lines.Using this method, oropharyngeal ...