Table 2 Antibody titers against SFG rickettsiae in the AI positive group (a), the AI negative group (b), and the healthy blood donors (c)
Antibody index positive (n = 99) | |||||||
a. | 1:64 | 1:128 | 1:256 | 1:512 | 1:1024 | 1:2048 | 1:4096 |
RR IgM | 1 | 0 | 0 | 1 | 0 | 0 | 0 |
RR IgG | – | 12 | 14 | 7 | 5 | 0 | 0 |
b. | Antibody index negative (n = 101) | ||||||
RR IgM | 0 | 2 | 0 | 0 | 0 | 0 | 0 |
RR IgG | – | 9 | 13 | 1 | 1 | 2 | 0 |
c. | Blood donors (n = 111/60) | ||||||
RR IgM | 1 | 0 | 0 | 1 | 0 | 0 | 0 |
RR IgG | – | 18 | 10 | 4 | 1 | 0 | 0 |