18 Manual of Veterinary Microbiology. 



vibrios; from it have also been isolated pathogenic 

 germs — staphylococcus pyogenes, etc. 



The stomach contains especially sarcinae, yeasts, 

 and elongated bacteria, whilst the intestines contain 

 large numbers of bacilli. Micrococci and elongated 

 non-sporulated bacteria are killed by contact with the 

 gastric juice, and, consequently, do not multiply in 

 the intestine. 



The mucus of the anterior respiratory passage is 

 likewise always contaminated with germs which have 

 been deposited by the inspired air, the latter itself be- 

 ing thus purified so as to emerge free from all germs. 

 Hence, it apppears that disease infection can not take 

 place through the expired air. The ocular mucosa 

 and genito-urinary mucosa near the external openings 

 contain also a certain number of microbes. 



Finally, these are found lodged upon the skin, the 

 perspiration and sebaceous secretion along with the 

 epidermic debris normally cast off constituting a good 

 medium for their preservation. 



The blood of healthy animals is free from germs. 

 In the pathological condition, on the other hand, most 

 of the tissues and fluids of the organism may become 

 the seat of the evolution of bacteria. 



