From: Laboratory diagnostics for human Leishmania infections: a polymerase chain reaction-focussed review of detection and identification methods
Parasitic index
Number of amastigotes per standard section
1+
≥ 1
2+
≥ 10
3+
≥ 100
4+
≥ 1000
5+
≥ 10,000
6+
≥ 100,000