TABLE 1: End point titers of indirect immunofluorescence assay for three rickettsia species of capybaras (Hydrochoerus hydrochaeris) (n=17) sampled in Campo Grande, midwestern Brazil.
| Capybara sera | IFAT titers for the following Rickettsia antigens | PAIHR | ||
|---|---|---|---|---|
| Rickettsia rickettsii | Rickettsia parkeri | Rickettsia amblyommatis | ||
| 1 | 1/128 | 1/128 | NR | |
| 2 | NR | 1/64 | NR | R. parkeri |
| 3 | NR | NR | NR | |
| 4 | NR | 1/256 | 1/128 | |
| 5 | 1/128 | 1/128 | NR | |
| 6 | 1/128 | 1/128 | NR | |
| 7 | 1/128 | 1/128 | 1/128 | |
| 8 | NR | 1/128 | 1/256 | |
| 9 | 1/2048 | 1/2048 | 1/512 | |
| 10 | 1/256 | 1/1024 | 1/256 | R. parkeri |
| 11 | 1/256 | 1/512 | NR | |
| 12 | 1/256 | 1/256 | NR | |
| 13 | NR | NR | NR | |
| 14 | 1/256 | 1/512 | NR | |
| 15 | 1/128 | 1/2048 | 1/1024 | |
| 16 | 1/64 | 1/256 | 1/64 | R. parkeri |
| 17 | NR | 1/128 | NR | R. parkeri |
PAIHR: A possible antigen involved in a homologous reaction (serum showing a Rickettsia species titer at least fourfold higher than that observed for any other Rickettsia species was considered homologous to the first Rickettsia species). NR: nonreactive at titer 64 or higher; IFAT: indirect immunofluorescence antibody test.