§ Mr. Viantasked the Minister of Health the source of the poliomyelitis viruses which are used in the manufacture of poliomyelitis vaccine; and how are the three types of viruses, used by the manufacturers, identified.
§ Mr. TurtonWith one exception, which was of British origin, all the strains of poliomyelitis virus used in the vaccine manufactured in this country came from clinical cases of poliomyelitis in the United States of America.
Types are identified by testing strains against prototype sera.