Abstract
Antibodies produced by inoculation of attenuated live measles vaccine were analyzed by sucrose density gradient centrifugation. When live vaccine was inoculated one month after inoculation of killed vaccine with one dose, 19S antibody was clearly demonstrated on the 18 days and on the 27 days after inoculation of live vaccine, but not on the 54 days. Antibody activity in 7S fraction was not dominant on the 18 days but increased predominantly on the 27 days. These antibody responses were quite similar to those of natural measles.
