TABLE 5.

Specificity and sensitivity of IgM-IB for 74 cases of leptospirosis and 48 cases of febrile illness not due to leptospirosis^c

IgM-IB result	No. of confirmed leptospirosis casesa
	Positive	Negative	Total
Positiveb	68	2	70
Negative	6	46	52
Total	74	48	122

^aLeptospirosis cases confirmed by MAT and/or cultivation.

^bBand recognition of leptospirosis, including the 14- to 18-kDa band and/or two other reactive bands among the 19- to 41/42-kDa bands.

^cThe sensitivity of IgM-IB was 91.9%, the specificity was 95.8%, the positive predictive value was 97%, the negative predictive value was 88.5%, and the accuracy was 93.4%.