BACILLUS PYOCYANEUS 193 



children. There may be a general sepsis under which 

 circumstances pleurisy, pericarditis, and the like may 

 be looked for. A diagnosis is made solely by finding 

 the pigment-producing bacillus in pus or other exudate, 

 or possibly by blood culture. Active immunity may 

 be produced in the lower animals by exceedingly 

 careful technic, but it has not been found profitable 

 to use the antiserum upon human beings. We know 

 little as yet of vaccine treatment in such infections. 



13 



