RD cells in the laboratory diagnosis of enteroviruses.

It is shown that, in addition to the already known replication of Coxsackie A viruses, 16 out of 18 different types of ECHO viruses tested as well as all three types of polioviruses can also be grown in RD cells with the development of a pronounced CPE. One of the exceptions, ECHO virus type 16, can be propagated in either HEL or HFDK cells and the other, ECHO virus type 22, in Vero cells. These four permanent or semi-permanent cell cultures thus prove very useful for the isolation of most of the diagnostically important enteroviruses as well as for their serological identification by neutralization in a micro-titer system described in this paper.