LIVE POLIO IRUS VACCINES

Preface
The accumulation of information on the use of attenuated live polioviruses as immunizing
agents against poliomyelitis has progressed at such a rapid pace since the PAHO/WHO Conference
on this subject in June 1959 that the need for further evaluation of the data became
evident.
The Pan American Health Organization and the World Health Organization, again with
the cooperation of the Sister Elizabeth Kenny Foundation of Minneapolis, Minnesota, therefore
agreed to convene a Second International Conference on Live Poliovirus Vaccines, which was
held in Washington, D. C., 6-10 June 1960. The new information presented at this meeting,
through formal papers and discussions, by 85 distinguished scientists from 20 nations, is
recorded in the following pages.
We wish to express our thanks to all concerned with the preparation of this volumeespecially
to the participants for promptly correcting the transcripts of their rem-rks-for
their efforts in making possible its early publication. The collaboration of Georgetown University
in making available the excellent facilities of its Edmund A. Walsh School of Foreign
Service is also gratefully acknowledged.
ABRAHAM HORWITZ
Director
Pan American Sanitary Bureau
Regional Office, World Health Organization