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Table 1 Prediction results of the flea index for plague epizootics confirmed by Y. pestis-positive great gerbils A and anti-F1 antibody-positive great gerbils (B)

From: Flea index predicts plague epizootics among great gerbils (Rhombomys opimus) in the Junggar Basin China plague focus

Prediction criterion Plague epizootic Total
Yes No
A  Flea index ≥ 12.63 (positive) 9 37 46
 Flea index < 12.63 (negative) 4 48 52
 Total 13 85 98
B  Flea index ≥ 10.59 (positive) 47 14 61
 Flea index < 10.59 (negative) 12 25 37
 Total 59 39 98