Mixed Infections 87 



The metabolic products of one species may intensify or accelerate 

 the action of those of an associated species, or the reverse may be 

 true, and the products of different organisms, having different 

 chemical composition, may neutralize one another, or combine to 

 form some entirely new substance which is entirely different from 

 its antecedents. Such conditions cannot fail to influence the type 

 and course of infection. 



