[Acanthamoeba keratitis. Morphologic and isoenzymatic study of a strain isolated from a medically treated case].

We report here the third case of Acanthamoeba keratitis discovered in France in a 30 year-old man wearing soft contact lenses. Amoebas of Acanthamoeba genus could be isolated twice from his corneal ulcer with simple ocular swabs. Owing to medical treatment alone, a successful healing of his eye was obtained. The isolated strain was studied morphologically and biochemically: the cysts observed microscopically after silver stain possessed less than six arms surrounded by a non reticulated ectocyst and belonged to group II defined by Pussard and Pons. But the isoenzymatic study of the ocular strain by isofocusing did not allow us to identify it with any one of the 18 reference strains used, although these represent 14 different described species.