VIM-1 was discovered in P. aeruginosa in Italy in 1996; since then, VIM-2 - now the predominant variant - was found repeatedly in Europe and the Far East; VIM-3 and -4 are minor variants of VIM-2 and -1, respectively.
A VIM-1 descubriuse en P. aeruginosa en Italia en 1996; desde entón, a VIM-2 atopouse repetidamente en Europa e Asia Oriental, que agora é a variante predominante; as VIM-3 e -4 son variantes menores das VIM-2 e -1, respectivamente.