T. cruzi Sylvio is inhibited by recombinant β-glucanase. Indicated amounts of dialyzed lysates or spent media, containing recombinant β-glucanase, harvested from transformed R. rhodnii were added to cultures of T. cruzi Sylvio. Turbidity of parasites treated with lysates from untransformed R. rhodnii (control lysate) was compared to that of the treatment group after 96-hours. Results are presented as the percent change in turbidity between treated and untreated cultures following this incubation period. The result shown here is a representative from two independent experiments.