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A Study of Strains of Pneumococci Immunologically Closely Related to Both Type XI and Type XVI Pneumococci¹

From the Thorndike Memorial Laboratory, Second and Fourth Medical Services (Harvard), Boston City Hospital, and the Department of Medicine, Harvard Medical School, Boston

Abstract

A study was made of representative strains of type XI and of type XVI pneumococci and of a number of strains which exhibited cross-reactions with serum for both these types. By tests for agglutination, passive protection in mice, capsular swelling (8) and absorption of agglutinins, the strains exhibiting cross-agglutinations were shown to be distinct from either type XI or type XVI but immunologically related to both.

Footnotes

¹ This study was aided, in part, by a grant given in honor of Francis Weld Peabody by the Ella Sachs Plotz Foundation.

The work was carried out with the technical assistance of Mrs. Mildred W. Barnes.