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
0
100%
2+
13
10
3
77%
1+
12
8
4
67%
1-12 bacilli/300 fields
6
2
75%
negative
9
1
11%