Abstract
Lymphocytic choriomeningitis virus was purified from cell culture fluid by density gradient centrifugation in colloidal silica. The specific infectivity increased 5000-fold and the recovery of infectivity was about 10%.
* Present address: Heinrich-Pette-Institut für Experimentelle Virologie und Immunologie an der Universität Hamburg, Martinistrasse 52, 2000 Hamburg 20, Federal Republic of Germany.