Practical preventive medicine . s. 7. Period oj Communicability.—Unknown. 8. Methods of Control. The Injected Person.—(a) Diag-nosis: By clinical manifestations in areas where the disease isknown to be endemic. (b) Isolation: None. (c) Immunization: None. (d) Concurrent Disinfection: None, but destroy any ticksthat may be on the patient. (e) Quarantine: None. (J) Terminal Disinfection: None. General Measures.—(a) The wearing of tick proof clothingby those in endemic areas, and following the practice of search-ing the body each day for ticks. (b) Destroying ticks on limited zones in infected ar
Practical preventive medicine . s. 7. Period oj Communicability.—Unknown. 8. Methods of Control. The Injected Person.—(a) Diag-nosis: By clinical manifestations in areas where the disease isknown to be endemic. (b) Isolation: None. (c) Immunization: None. (d) Concurrent Disinfection: None, but destroy any ticksthat may be on the patient. (e) Quarantine: None. (J) Terminal Disinfection: None. General Measures.—(a) The wearing of tick proof clothingby those in endemic areas, and following the practice of search-ing the body each day for ticks. (b) Destroying ticks on limited zones in infected areas byclearing, and burning vegetation in rotation. (c) Grazing sheep on infected areas. The ticks attachthemselves to the sheep, become enmeshed in the wool andperish. (d) Dipping of the other domestic animals of infected areasin arsenical solutions. (e) Destruction of ground squirrels, chipmunks and otherrodents in infected areas by poisoned grain, by CS2 and bytrapping. LOWER ANIMALS AS SOURCES OF INFECTION FOR MAN 211. Fig. 91.—The RockyMountain spotted-fever tick, Dermacentor venustus.^ 1. Deposited-out female with eggs. 2. Unengorged larva. 3. Deposited-out female, frontal view. 4. Engorged larva. 5. Engorged female, dorsalview. 6. Unengorged female, dorsal view. 7. Male, dorsal view. 8. Male,ventral view. 9. Unengorged female, ventral view. (Hooker, Bishopp andWood, Bull. 106, Bureau of Entomology, U. S. Dept. of Agriculture.) 212 PRACTICAL PREVENTIVE MEDICINE RABIES i. Infective Agent.—Unknown, a filterable virus. 2. Source o] Infection.—Typical and atypical cases and incu-batory carriers in dogs, and other carnivorous animals. 3. Portal oj —In the saliva of infected animals. 4. Route oj —Inoculation with the saliva ofinfected animals, through wounds or abrasions of the skin andmucosa, almost always by bites or scratches. 5. Portal oj Entrance.—Through the subcutaneous tissue tothe terminal nerve fibers. 6. Incubation Period.—Vari
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