40 slit and scrape smears in a planned study and 35 routine smears picked up from the laboratory were examined. An end-to-end examination of the smears detected additional positives and gave a higher bacterial index than what was reported in the routine. Acid-fast bacilli were found to be distributed in only 1 to 3 per cent of the fields in the smears. The bacilli were found mostly in the centre and in narrow bands between centre and periphery of the smears. Some of the high BI smears were found to contain areas completely free from bacilli.
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