Antibody Response to Infections With the Newly Classified Types of Pneumococci (Cooper) 1

The separation of the pneumococci previously included in Group IV into serologically specific types (1) has made possible the accurate identification of nearly all pneumococci. In this paper will be presented the re- sult of studies on the specific antibody response of human subjects to infections associated with these newly classified types of pneumococci. Similar studies in patients with 2 important pairs of immunologically re- lated types of pneumococci, namely, Types III and VIII and Types II and V, have been reported in the preceding communications (2, 3) and only a summary of these results are included here for comparison.