Abstract
A treatment preparation composed of purified Leishmania (L) antigenic fractions (AS210) induced linear delayed type hypersensitivity (DTH) reactions over a 1-40 microg dose range, in guinea pigs. When a DBA-1 mouse collagen induced arthritis (CIA) model was used to compare AS210 treatment against: a polyvalent vaccine (AS110-1), a monovalent vaccine (AS110-2) and placebo, the AS210 treated mice had the least amount of forepaw inflammation and the lowest mean arthritis scores (MAS). When MAS for day(s) 1-40 were analyzed using one way ANOVA, statistically significant (P < 0.05) differences were seen for the following study groups: PBS versus Dexamethasone and PBS versus AS210. Subsequently, the ANOVA analysis results were corroborated by the Mann-Whitney test: analysis of the first group (P < 0.001) and analysis of the second group (P < 0.001). Comparison between dexamethasone and AS210 at different time intervals by Mann-Whitney test were as follows: day 0-day 5 both treatments had equal values (P = 1.00), from day-7 to 20 AS210 treatment had lower MAS values than dexamethasone (P = 0.037), and from day-21 to 30, AS210 MAS were similar to dexamethasone values (P = 0.319). No statistical difference was observed between AS110-1, AS110-2, and placebo groups.
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