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Toxicity and virulence of different Salmonella strains in SCID mice. SCID mice (five animals per group) were infected intragastrically with the wild-type strain ST14028 (1 × 103 cfu), and vector strains SL7207 (5 × 105 cfu) or SL201 (1 × 109 cfu) carrying pU6-mPR1, and the survival of the animals was recorded.
