Table 3. BU case confirmation by PCR and ZN.

Year	No. of Cases	PCR Positive	ZN Positive	Both PCR and ZN Positive	ZN Negative but PCR Positive
2008	42	22	7	1	2
2009	63	48	30	25	18
2010	495	281	180	99	175
2011	609	327	127	96	230
2012	330	136	59	44	86
2013	283	117	43	37	79
2014	249	58	28	25	33
2015	84	24	14	14	18
2016	48	7	3	3	4
Total	2203	1020	491	344	645