Ridley logarithmic scale for lepra...
0no bacilli in any field
1+1-10 bacilli in 100 fields
2+1-10 bacilli in 10 fields
3+1-10 bacilli in each field
4+10-100 bacilli in each field
5+100-1000 bacilli in each field
6+> 1000 bacilli in each field.
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