World survey of typhoid and paratyphoid-B phages types.

The results achieved through international co-operation in the field of enteric phage typing and the methods by which these results were obtained are reviewed. The data are derived mainly from reports submitted by the author to the International Committee for Enteric Phage Typing (ICEPT) on the occasion of its meetings during the Fifth and Sixth International Congresses for Microbiology. Phage typing of S. typhi and S. paratyphi B are examined, and the progress achieved since the inception of the ICEPT is discussed. The necessity of calculating frequency distribution of types by foci is emphasized, and the author gives a summary of the results of surveys of the geographical distribution of typhoid and paratyphoid-B phage types.