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Table 1 Positive and inconclusive results by real-time polymerase chain reaction and the corresponding virus isolation and enzyme-linked immunosorbent assay (ELISA) results.*

From: Diagnosis of foot-and mouth disease by real time reverse transcription polymerase chain reaction under field conditions in Brazil

  

Virus isolation

Sample no.

Ct value

CPE

ELISA

527

42.22

Negative

ND

567

44.26

Negative

ND

605

44.26

Positive

Negative

613

34.94

Positive

Negative

652

41.52

Negative

ND

674

36.60

Positive

Positive (type O)

675

35.20

Positive

Positive (type O)

  1. * Origin of samples was Eldorado/Japorã, State of Minas Gerais. Ct (cycle threshold) corresponds to the number of cycles required for a given sample to reach the threshold above which it is considered positive. A sample was considered positive when the Ct value was lower than 40, and inconclusive when the Ct value was higher than 40. CPE = cytopathic effect; ND = not determined. Only samples that resulted in CPE were processed for indirect sandwich ELISA.