METHOD OF PREPARING AN ATTENUATED TRANSMISSIBLE GASTROENTERITIS (TGE)VIRUS STRAIN FOR USE IN LIVE VACCINES

摘要

A B S T R A C TA method of preparing a live, attenuated TGE virus strain,characterized in that a non-virulent, immunogenically active virus strainis prepared by subjecting a virulent TGE strain to a large number of tissueculture passages.