SPECIAL BACTERIOLOGY 
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VIII. Immune Treatment 
Immune treatment is both prophylactic and curative, 
and consists in administering the antitetanic serum, in¬ 
travenously or intraspinally. The serum is prepared by 
injecting a horse with gradually increasing doses of the 
tetanus bacilli or broth filtrate, and obtaining the horse’s 
blood, separating the blood serum and testing its anti¬ 
toxic (that is, exotoxin-neutralizing properties). 
IX. Summary of Important Characteristics 
B. tetani causes lockjaw, is a Gram-positive, spore-bear¬ 
ing, motile (in spore form) bacillus, having the appear¬ 
ance of a drumstick, anaerobe, produces exotoxin; anti- 
tetanic serum is a perfect preventive and a good cura¬ 
tive agent, if not given too late. 
