[Sensitivity of different mouse strains to Streptococcus pneumomiae serotype 3]

The sensitivity of different mouse strains to Str. pneumoniae, serotype 3, after the intraperitoneal injection of the infective agent was studied. These experiments revealed that the animals under study, so far as their susceptibility and sensitivity were concerned, formed a single group, highly sensitive to this serotype. The sublethal dose of the pneumococcus was determined. The distribution of pneumococci in the organs during a definite time interval was shown and the fact of the prolonged carriership of the capsular forms of the pneumococci was established.