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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