weanling rats were immunized with a heat-labile enterotoxin contained in whole cell lysate ( wcl ) ultrafiltrate preparations of enteropathogenic ( epec ) and enterotoxigenic ( etec ) strains or with a purified preparation of heat-labile toxin ( lt ) from the etec strain and then challenged either with viable bacteria of each strain or the purified etec lt by means of the ileal ligated loop technique .
C0014372
enterotoxin
C0040549
lt