Definition: a suspension of Salmonella typhi inactivated either by heat or by chemical (acetone) with an added preservative; in the U.S., the combined typhoid and paratyphoid A and B vaccines have been largely replaced by the monovalent typhoid vaccine because of the lack of evidence of effectiveness of paratyphoid A and paratyphoid B ingredients.
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Examples: glitazone, GI cocktail, etc.