3 mL plain blood Paired acute and convalescent sera (3 – 6 weeks after onset of fever) should be sent. Acute phase sera are tested alone; a convalescent specimen is requested and when received will be run together with the acute phase sera.
Results reported as “Detected” or “Not detected” at the
screening titre (1:128) for the acute phase sera.
If both acute and
convalescent sera are received, they will be run at doubling dilutions from
1:128 to 1:1024.
A fourfold rise in titre between acute and
convalescent sera is considered proof of ongoing infection.
A single sample titre
is considered inconclusive.
Range 1 – 4 days
Monday – Friday
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