Accession Number:

AD0678894

Title:

THE STRUCTURE OF A NATURAL TULAREMIA FOCUS OF THE FLOOD PLAIN TYPE

Descriptive Note:

Corporate Author:

ARMY BIOLOGICAL LABS FREDERICK MD

Report Date:

1963-11-21

Pagination or Media Count:

7.0

Abstract:

The active or elementary foci of tularemia are located on small unflooded areas which are among the extensive territories solidly inundated during the floods. The elementary foci are stable--the tularemia infection is found in them every year. The elementary foci are characterized by their multiple-vector and multiple-host nature. The maintenance and circulation of the infection in them are maintained by two species of ixodial ticks-- Dermacentor marginatus and Rhipicephalus rossicus--and by a number of species of rodents highly sensitive to tularemia--the water rat, meadow vole, house mouse and common hamster. A characteristic feature of the elementary foci is the seasonal concentration of small rodents on their territory, particularly the water rat, which is brought about by the flood. A considerable number of the larvae and nymphs of ixodial ticks feeds on these rodents and is responsible for maintaining the tularemia infection.

Subject Categories:

  • Medicine and Medical Research
  • Microbiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE