Volume 14, Number 12—December 2008
Letter
Rickettsia sp. in Ixodes granulatus Ticks, Japan
Hiromi Fujita, Teruki Kadosaka, Yoshiki Nitta, Ichiro Takajo, Ai Takano, Haruo Watanabe, and Hiroki Kawabata
Table
Serotype results for Rickettsia sp. strains GRA-1 and GRA-2 from Ixodes granulatus tick, Okinawa Prefecture, Japan
| Mouse antiserum to | Results* |
|||||||
|---|---|---|---|---|---|---|---|---|
| GRA-1 | GRA-2 | TT-118 | Aoki | IO-1 | AT-1 | 246 | Moroccan | |
| Strains from this study | ||||||||
| Rickettsia sp., GRA-1 | 320† | 320 (0)‡ | 160 (1) | 80 (3) | 40 (6) | 40 (6) | 80 (4) | 80 (3) |
| Rickettsia sp., GRA-2 |
320 (0) |
320 |
320 (0) |
40 (4) |
20 (7) |
40 (7) |
40 (5) |
40 (5) |
| Reference strains | ||||||||
| R. honei, TT-118 | 5,120 (1) | 5,120 (0) | 5,120 | 80 (7) | 320 (7) | 80 (9) | 160 (7) | 80 (7) |
| R. japonica, Aoki | 2,560 (3) | 2,560 (4) | 1,280 (7) | 5,120 | 320 (9) | 320 (10) | 320 (9) | 32 0 (8) |
| R. asiatica, IO-1 | 640 (6) | 640 (7) | 80 (7) | 160 (9) | 5,120 | 80 (12) | 80 (11) | 160 (11) |
| R. tamurae, AT-1 | 640 (6) | 320 (7) | 80 (9) | 80 (10) | 80 (12) | 5,120 | 160 (11) | 40 (13) |
| R. sibirica, 246 | 1,280 (4) | 1,280 (5) | 320 (7) | 160 (9) | 160 (11) | 80 (11) | 5,120 | 320 (7) |
| R. conorii, Moroccan | 640 (3) | 640 (5) | 80 (7) | 80 (8) | 20 (11) | 20 (13) | 160 (7) | 1,280 |
*Highest serum dilutions against each Rickettsia antigen (specificity difference between each pair of strains), determined by microimmunoperoxidase method. Boldface indicates equivocal titer to homologous antigen.
†Highest serum dilution showing a positive reaction with antigen.
‡Specificity difference between each pair of strains.
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