Green nail syndrome (GNS) is the most common bacterial infection of the nail unit.
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Green nail syndrome (GNS) is the most common bacterial infection of the nail unit. Both the
upper and lower extremities may be affected in GNS, but is uncommonly reported as a primary
cause of onychodystrophy. The causative organism, Pseudomonas aeruginosa, is a gramnegative bacteria which is ubiquitous in nature
favoring warm and moist environments with reservoirs in soil, water, plants and animals.
Infection of the nail results in chloronychia as a direct result of the production of pyoverdin
and pyocyanin by P. aeruginosa.