Abstract
Conclusions
These results in conjunction with those of the previous study indicate that 3 groups of poliomyelitis virus have been demonstrated. I. One group encompasses at least 9 viruses compared in this study: Bk, McK, Ca., Fr, Mi, Gu, KO, Cp. and Br. This group, which includes the greatest number tested to date has been designated tentatively as Group I. II. Another group so far comprises the La and MV viruses. III. A third virus, Le, differs sufficiently from the above two groups to represent a third group.
Get full access to this article
View all access options for this article.