From: Cutaneous hypersensitivity reactions to freshwater cyanobacteria – human volunteer studies
+/- | Uncertain reaction: faint macular erythema only |
---|---|
+ | Weak (nonvesicular) positive reaction; erythema, infiltration, possibly papules |
++ | Strong (vesicular) positive reaction; erythema, infiltration, papules, vesicles |
+++ | Extreme positive reaction; bullous reaction |
- | Negative reaction |
IR | Irritant reaction of different types |