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(b) The clinical particulars of those patients showing
a change of hæmolytic streptococcal type confirmed the
work of Allison and Brown, who found that the majority
of late complications occurring in multiple-bed wards
devoted to scarlet fever was associated with such a
change. It was also noted that when such a change
occurred it was usually observed after the second week
of hospitalisation, and frequently even later. In thirtyseven
patients in Blocks A and B a change of type was
observed, occurring in six between the fourteenth and
twenty-first day following admission, and in twenty-five
at or after the twenty-first day.
(c) Except in very few instances complications arising
early in the disease were not associated with a change
of hemolytic streptococcal type.

(In this table are included scarlet fever patients investigated
in both the. preliminary and the experimental
periods.)