INCREASED RESISTANCE TO INFECTION AND ACCOMPANYING ALTERATION IN PROPERDIN LEVELS FOLLOWING ADMINISTRATION OF BACTERIAL LIPOPOLYSACCHARIDES

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Abstract
It has been shown that injection of lipopolysaccharides, derived from a variety of Gram-negative bacterial species, evokes in mice a rapidly developing rise in resistance to infection with Gram-negative pathogens. This is accompanied by an elevation in properdin titer, at times to levels 2 to 3 times the normal. The rate, magnitude, and duration of these responses are dependent on many factors, the most important of which are the quantity and timing of the lipopolysaccharide administered.