<prompt> 4 split skin smears of a single patient.Two samples with 10 bacilli out of 100hpf and 2 samples with 1000 bacilli out of average fields Bacteriological index?3.54.55.56.5  <response>: RIDLEY;S LOGARITHMIC SCALE FOR BACTERIOLOGICAL INDEX: Bacteriological IndexBI: Density of bacilli in smears, including both living and dead bacilli . Ridley;s logarithmic scale: Based on the number of bacilli seen in an average High power microscopic field, using an oil-immersion objective 112 in or 2mm When several smears are taken: Mean index is calculated Score Description 6 Many clumps of bacilli in an average field Over 1000 5 100-1000 bacilli in an average field 4 10-100 bacilli in an average field 3 1-10 bacilli in in an average field 2 1-10 bacilli in 10 fields 1 1-10 bacilli in 100 fields In the given question, Two samples have 10 bacilli in 100hpf each 1 score and Tw samples with 1000 bacilli in average field each 6 score BI 11664 3.5 Ref: Park 25th edition Pgno: 337 