Table 1.
Seroreactivity of opossums against Rickettsia typhi, Rickettsia felis, and Rickettsia rickettsii antigens
| Opossum | Reciprocal IFA titer |
||
|---|---|---|---|
| R. typhi | R. felis | R. rickettsii | |
| 1 | 256 | NR | NR |
| 2 | 8,192 | 512 | 256 |
| 3 | NR | NR | NR |
| 4 | 4,096 | 128 | 256 |
| 5 | NR | NR | NR |
| 6 | NR | NR | NR |
| 7 | 1,024 | NR | 128 |
| 8 | 1,024 | NR | NR |
| 9 | NA | NA | NA |
| 10 | 1,024 | NR | NR |
| 11 | 2,048 | NR | NR |
| 12 | NR | NR | NR |
| 13 | 1,024 | NR | NR |
| 1,448* | 256* | 203* | |
IFA = immunofluorescence assay; NA = not available; NR = nonreactive at a titer of 1:128.
*
Geometric mean of the reciprocal titer for reactive samples.