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Volume 14, Number 12—December 2008

Letter

Rickettsia sp. in Ixodes granulatus Ticks, Japan

Hiromi Fujita, Teruki Kadosaka, Yoshiki Nitta, Shuji Ando, Ai Takano, Haruo Watanabe, and Hiroki KawabataComments to Author 
Author affiliations: Ohara General Hospital, Fukushima, Japan (H. Fujita); Aichi Medical University School of Medicine, Aichi, Japan (T. Kadosaka); Okinawa Prefectural Institute of Animal Health, Okinawa, Japan (Y. Nitta); National Institute of infectious Diseases, Tokyo (S. Ando, A. Takano, H. Watanabe, H. Kawabata); Gifu University, Gifu, Japan (A. Takano)

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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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