ACTINOMYCOSIS 163 



especially upon media containing animal substances such 

 as blood serum. Their optimum temperature is 40 C. 

 or 102 F. They are killed at 75 C. or 167 F. exposed 

 ten minutes. They resist drying for a long time. 

 They are extremely resistant to chemical disinfectants. 

 Not all animals are susceptible to actinomycosis, 

 but those contracting it present about the same type 

 of lesions. Nothing in their blood serum is of any 

 value in treatment of human beings. Vaccines are 

 not used. 



