In an oil immersion field 1-10 tubercle bacilli were seen per 10 field. It indicates

Ref: PubMed; style="font-size: 1.04761904761905em; font-family: Times New Roman, Times, serif; margin: 0 0 0 8px; text-indent: 0">* Oil immersion is a technique used to increase the resolving power of a microscope. This is achieved by immersing both the objective lens and the specimen in a transparent oil of high refractive index, thereby increasing the numerical aperture of the objective lens.Reporting the Bacterial Index* The results are reported on a 0 to 6+ semi-logarithmic scale using a descriptive phrase or numerical code. This is an indicator of the total bacillary load of the patient. It falls about 1 point per year during effective treatment as dead bacilli undergo lysis and are absorbed.Very numerous(+6)Over 1000 bacilli per oil immersion fieldNumerous(+5)100 to 1000 bacilli per oil immersion fieldModerate(+4)10 to 100 bacilli per oil immersion fieldFew(+3)1 to 10 bacilli per oil immersion fieldVery few(+2)1 to 10 bacilli per 10 fieldsRare(+1)1 to 10 bacilli per 100 fieldsNone found(NF)No AFB seen on entire site