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Table 3 Performance of the biochip-based assay depending on the concentration of acid-fast bacilli in clinical samples (n = 61)

From: Detection of second-line drug resistance in Mycobacterium tuberculosis using oligonucleotide microarrays

Smear grade No. of samples Positive result on biochip Negative result on biochip Sensitivity
3+ 19 19 0 100%
2+ 13 10 3 77%
1+ 12 8 4 67%
1-12 bacilli/300 fields 8 6 2 75%
negative 9 1 8 11%