TABLE 1.
Summary of rickettsial strains used to infect D. andersoni ticks during feeding
| Rickettsia | Strain | Source | Location and date collecteda | Passage historyb |
|---|---|---|---|---|
| R. rickettsii | Como-96 | D. andersoni | Como Lake, 1996 | 2VCc/1M/1GP |
| R. rickettsii | Wachsmuth | D. andersonid | Tin Cup, 1974 | 1GP/6CE/2VC |
| R. rickettsii | R | D. andersoni | Blodgett, 1945 | 4GP/53CE/1PCEc/5CE/6VC |
| R. rickettsii | Sawtooth | D. andersoni | Sawtooth, 1961 | 8T/1GP/17CE/8VCc |
| R. rickettsii | Swan | Human (fatal) | Bass Creek, 1975 | 10CE |
| R. montana | M/5-6 | Microtus | Broadus, Mont. 1963 | 7CE/4VC |
a
All R. rickettsii strains originated from the western slopes of the Bitterroot Valley, Mont.
b
Abbreviations: VC, Vero cells; M, Microtus; GP, guinea pig; CE, chicken yolk sac; PCE, primary chicken embryonic cells; T, wood tick generations.
c
Plaque purified (59).
d
Partially engorged adult female tick collected from a human with RMSF; other tick sources collected by flagging.