1 66 ESSENTIALS OF BACTERIOLOGY 



almost constant attendant. It is often associated with the 

 diphtheria bacillus in true diphtheria, and is the cause of 

 many of the diphtheritic complications. It is associated with 

 the influenza bacillus in acute ear suppurations; with pneu- 

 monia bacteria; with tubercle bacilli, and in such instances 

 usually causes high fever. In osteomyelitis and mastoiditis 

 it is usually the sole cause. 



Streptococci in Milk. In milk streptococci are often found, 

 but it is not considered an absolute indication of udder in- 

 flammation. 



Protective Sera. An antistreptococcic serum has been used 

 as a curative agent in puerperal fever, scarlatina, and other 

 diseases supposed to be due to this germ. The antistrepto- 

 coccic sera have been given an extensive trial in a variety 

 of suppurative and inflammatory diseases, but the results 

 are still under discussion. 



Coley's Fluid. A mixture of a culture of pyogenes and 

 prodigiosus has been used as an injection, with apparent 

 benefit, in inoperable cases of sarcoma, and is known as 

 Coley's fluid. 



Immune Bodies. Neither antitoxic nor bactericidal bodies 

 have been found in the blood of animals made resistant by the 

 injection of dead or attenuated cultures. 



Polyvalent (Vaccines) Bacterins. As it is possible that there 

 are several varieties of streptococci, and varying in patho- 

 genic properties, bacterins made from several strains have 

 been used as injections against suppurative processes, and 

 with some degree of success. Autogenous bacterins are 

 more reliable. 



Distribution. Streptococci can often be found in air, dust, 

 on the skin, on all the mucous surfaces, pharynx, conjunctiva, 

 tonsils. 



Staphylococcus Pyogenes Aureus (Rosenbach). 

 Origin. Found commonly in pus (80 per cent, of all suppura- 

 tions), in air, water, and earth; also in sputum of healthy 

 persons. 



Form. Micrococci in clusters like bunched grapes, hence 



