Volume 11, Number 4—April 2005
Dispatch
Human Spotted Fever Rickettsial Infections
George B. Schoeler*1, Cecilia Morón†, Allen L. Richards‡, Patrick J. Blair§, and James G. Olson§
Table 1
EIA and IFA test results for antibodies to Rickettsia rickettsii among patients from 4 areas of Peru*
| Department | EIA |
IFA |
EIA and/or IFA |
|||
|---|---|---|---|---|---|---|
| No. tested† | No. positive (%)‡ | No. tested† | No. positive (%)§ | No. tested† | No. positive (%) | |
| Cusco | 36 | 6 (17) | 56 | 11 (20) | 67 | 16 (24) |
| Junin | 42 | 8 (19) | 19 | 2 (11) | 53 | 10 (19) |
| Piura | 50 | 4 (8) | 0 | 50 | 4 (8) | |
| Total | 128 | 18 (14) | 75 | 13 (17) | 170 | 30 (18) |
*By enzyme immunoassay (EIA) or indirect immunofluorescence antibody assay (IFA).
†Febrile patients from whom acute- and convalescent-phase serum specimens were available for testing.
‡Criterion for confirmation was a ≥4-fold increase in R. rickettsii immunoglobulin (Ig) G antibody titer from acute to convalescent phase of illness by EIA.
§Criterion for confirmation was a ≥4-fold increase in R. rickettsii IgG antibody titer from acute to convalescent phase of illness by IFA.
