Mixed Infections

Mixed bacterial infections are responsible for many puzzling groups of symptoms. The difficulties of diagnosis are increased because at one time there is a summation of effects, and at another the secondary results are more or less overshadowed by the predominant organisms. To take the case of tuberculous infections : the exudative pneumonia which occurs is generally the result of a secondary invading pneumococcus ; the exudates *n tuberculous pleurisy are almost always pneumococcal at flrst, the pneumococcus dying out later and leaving the fluid sterile ; the hectic fever is probably due to the action of