MICROBIC VIRULENCE AND HOST SUSCEPTIBILITY IN PARATYPHOID-ENTERITIDIS INFECTION OF WHITE MICE : IV. THE EFFECT OF SELECTIVE BREEDING ON HOST RESISTANCE

If mice surviving a lethal dose of mouse typhoid bacilli are inbred consecutively for a number of generations, the resulting offspring become progressively more resistant to mouse typhoid infection and to mercury bichloride intoxication than similar control mice not so selected.