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Summary
Naegleria fowleri lifecycle stages.
A: Cyst of N. fowleri in culture.
Naegleria fowleri does not form cysts in human tissue. Cysts in the environment and culture are spherical, 7-15 µm in diameter and have a smooth, single-layered wall. Cysts have a single nucleus.
B: Trophozoites of N. fowleri in culture.
C: Ameboflagellate trophozoite of N. fowleri.
There are two forms of trophozoites in Naegleria fowleri: ameboid and ameboflagellate, only the former of which is found in humans. The ameboid trophozoites measure 10-35 µm but when rounded are usually 10-15 µm in diameter. In culture, trophozoites may get over 40 µm. The cytoplasm is granular and contains many vacuoles. The single nucleus is large and has a large, dense karyosome and lacks peripheral chromatin.
Copyright status:
This image is public domain because it was first published by the U.S. Center for Disease Control
Source:
http://www.dpd.cdc.gov/dpdx/HTML/ImageLibrary/FreeLivingAmebic_il.htm
http://www.dpd.cdc.gov/dpdx/HTML/ImageLibrary/A-F/FreeLivingAmebic/body_FreeLivingAmebic_il10.htm
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| Date/Time | Thumbnail | Dimensions | User | Comment |
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| current | 20:51, 24 March 2009 |  | 285 × 710 (51 KB) | Ashcraft | ''Naegleria fowleri'' lifecycle stages. '''A: Cyst of N. fowleri in culture.''' Naegleria fowleri does not form cysts in human tissue. Cysts in the environment and culture are spherical, 7-15 µm in diameter and have a smooth, single-layered wall. Cyst |
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