| dc.description |
Eight strains of inbred mice fell into two sharply defined groups. Four strains (CBA, AllAX, C3H/He, and DBA/2) were resistant (LD<sub>50</sub>, >10<sup>5</sup> ) to Salmonella typhimurium C5 given subcutaneously. The other four strains (Balbi c, C57BL, B10.D2 [new line], and DBAI 1) were susceptible (LD<sub>50</sub>, <10). No intermediate resistance was seen. Examination of the F1, F2, and parental backcross generations bred from matings of CBA and Balbi c mice showed that resistance behaved as a simple Mendelian dominant. Resistance was not linked to H-2 genes, and no useful marker has yet been found. However, as previously demonstrated in the parent strains, resistance in the hybrids was related to the ability to produce a good delayed-type hypersensitivity reaction to an extract of S. typhimurium. |
