Hartmanella and Acanthamoeba species
Pathogenesis--(mild disease process). At one time, the disease caused by N.
fowleri was thought to be caused by these two genera. At present, it is believed that
there is no pathogenicity caused by Hartmanella species, but Acanthamoeba species
are still believed to produce infection in man.
Laboratory identification--same as N. fowleri except for the absence of the
ORGANISM 6 -- Ensolimax nana
COMMON NAME: None.
GEOGRAPHICAL DISTRIBUTION: Cosmopolitan.
HABITAT: Intestines (colon).
INTERMEDIATE HOST: None.
RESERVOIR HOST: None.
INFECTED FORM: Mature, quadrinucleated cyst.
MODE OF INFECTION: Ingestion.
SPECIMEN SOURCE: Feces.
Figure 1-15. Life cycle of Endolimax nana.