36 MISCELLANEOUS INFECTIONS 



the one isolated from the cows in the outbreaks mentioned. 

 Another cow in this herd was found to have her udder per- 

 manently infected with a streptococcus. Another animal in 

 the same dairy suffered repeatedly from acute streptococcus 

 mastitis. 



There are a large number of morbid conditions more or 

 less frequently encountered in domesticated animals, which 

 seem to be due to infection of some kind but which are not 

 demonstrated to be of such an origin. These will continue to 

 be attributed by some to infection and by others to various 

 general causes until the truth concerning their etiology is 

 revealed. 



VII. 



§ i8. Miscellaneous infections. Attention should be 

 called to the many morbid conditions, resulting from infection, 

 that are encountered in different species of animals and 

 are liable to be attributed to other agencies. Usually such 

 lesions are referred to general pathological conditions, but a 

 more careful inquiry will reveal the presence of infection. 

 Among these, may be mentioned pericarditis in cattle, so fre- 

 quently associated with punctures by foreign bodies. The 

 extensive exudative inflammations in these cases are frequently 

 associated with micrococci. The same has been true of certain 

 cases of localized endocarditis resulting in the formation of fun- 

 goid, purulent, or necrotic masses about the valves of the heart. 

 When one considers the possibilities of infection from acci- 

 dental causes, as well as from surgical interference, together 

 with the agency of metastasis, it is not difficult to understand 

 how such a variety of morbid conditions can come about. 

 Infection, therefore, forms an important part of pathology, out- 

 side of those specific organisms that cause epizootics of greater 

 or less severity. 



REFERENCES. 



I. Boi^LlNGER. Mycosis der Lunge beim Pferd. Archiv fur 

 pathol. Anat., Bd. XLIX (1870), S. 583. 



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