Accession Number : AD0675168

Title :   EXPERIMENTAL STUDY OF THE DEVELOPMENT OF RICKETTSIA PROWAZEKI IN THE ORGANS OF HEAD LICE,

Corporate Author : ARMY BIOLOGICAL LABS FREDERICK MD

Personal Author(s) : Pshenichnov,A. V. ; Grembovskaya,A. V.

Report Date : APR 1968

Pagination or Media Count : 6

Abstract : Larvae and nymphs of body and head lice, under optimum conditions, feed on the skin of man approximately the same number of times (3-8) in 24 hours. Adult lice, especially the females, feed more often (body lice - 5-8 times, head lice - 6-12 times in 24 hours). Body lice survive well following a double feeding in 24 hours, while the head lice die off after 2-4 days. Under optimum conditions, both types of lice survive almost up to 2 months. In head lice, typhus rickettsiosis develops with somewhat different regularities than in body lice: The appearance of Rickettsia prowazeki is recorded with a delay by 3-5 days, the concentration of virus in the insects is considerably lower and hemolytic inhibition is absent, but the rickettsia are preserved longer than in the body lice. (Author)

Descriptors :   (*LICE, *RICKETTSIA PROWAZEKII), LARVAE, NYMPH, GROWTH(PHYSIOLOGY), SURVIVAL(PERSONNEL), LIFE CYCLES, EPIDEMIOLOGY, DISEASE VECTORS, USSR

Subject Categories : Anatomy and Physiology
      Microbiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE