Effectiveness of parenteral and oral typhoid vaccination in mice challenged with a Salmonella typhi-Salmonella typhimurium hybrid

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Abstract
Live Salmonella typhi administered intraperitoneally, acetone-killed S. typhi administered intraperitoneally, and live S. typhi given orally, with their effectiveness decreasing in that order, protected Swiss white mice against death from challenge with a virulent Salmonella typhimurium hybrid expressing S. typhi antigens.