Volume 11, Number 4—April 2005
Dispatch
Ross River Virus Disease Reemergence, Fiji, 2003–2004
Table
Results of tests of patients’ serum for antibodies to selected alphaviruses*
IgM results† |
PRNT titers‡ |
|||||
---|---|---|---|---|---|---|
Patient | Interval (d)§ | RRV | BFV | RRV | BFV | SINV |
1 | 10 | Positive | Negative | 320 | <10 | <10 |
21 | Positive | Negative | 1,280 | <10 | <10 | |
141 | Equivocal | Negative | 160 | ND | ND | |
2 | 16 | Positive | Negative | 5,120 | <10 | ND |
33 | Positive | Negative | 5,120 | <10 | ND |
*Ig, immunoglobulin; PRNT, plaque-reduction neutralization test; RRV, Ross River virus; BFV, Barmah Forest virus; SINV, Sindbis virus; ND, not done.
†IgM-capture enzyme immunoassay; samples tested at 1:400 dilution; positive samples had a positive-to-negative (P/N) absorbance ratio >3.0; equivocal samples had a P/N ratio 2.0–3.0 (10); no test for anti-SINV IgM was available.
‡90% plaque-reduction endpoints; >10 is considered positive (11).
§From onset of illness to serum collection.
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