Volume 18, Issue 6
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Results of tests for rickettsiae and viruses on 4,266 ticks taken from more than 10,000 birds, comprising 150 species, in the eastern United States indicated the presence of two agents: and an agent of the typhus group. Infection with was indicated in 24 pools of , five pools of , one pool of , and two pools that contained both and . The pools positive for were from a variety of locations in the eastern U.S. The typhus-group agent was demonstrated only once, in a single pool of taken at Kent Point, Maryland. A strain of was isolated from a pool of 21 larval collected at Ocean City, Maryland. This agent possessed several characteristics of other strains of low virulence isolated previously in this region by various authors.


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