<prompt> Epidemic marker of TB -Sputum AFB positivity rateTuberculin test positivity rateChest x-ray positivity rateNone of the above  <response>: Ans. is a i.e., Sputum AFB Positivity rate o Case finding tools in TB are :-1 Sputum microscopy It is the method of choice2 Sputum culture It is 2nd in importance after sputum microscopy in a case finding programme.3 Mass miniature radiography It has been stopped as a general measure of case finding.4 Tuberculin test It is of little value as a case finding tool as it has no diagnostic value.o The number of bacilli seen in a smear reflects disease severity and patient infectivity.o Therefore, it is important to record the number of bacilli seen in each smear.Number of bacilliResult reportedNo. AFB per 100 oil immersion fields01-9 AFB per 100 oil immersion fieldsScanty or number AFB seen10-99 AFB per 100 oil immersion fields 11-10 AFB per oil immersion fields 2 10 AFB per oil immersion fields 3 