「Amoebiasis」の版間の差分
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*cyst has 4 nuclei, each nucleus has a nucleolus | *cyst has 4 nuclei, each nucleus has a nucleolus | ||
| − | ==''Entamoeba dispar== | + | ==''Entamoeba dispar''== |
*formerly named as ''E. histolytica'' in 1903 | *formerly named as ''E. histolytica'' in 1903 | ||
*non-pathogenic type of old ''E. histolytica'' was distinguished as ''E. dispar'' in 1925 | *non-pathogenic type of old ''E. histolytica'' was distinguished as ''E. dispar'' in 1925 | ||
2021年4月27日 (火) 09:35時点における版
目次
Entamoeba histolytica
epidemiology
- worldwide
- 40-50 mil. symptomatic cases per year
- number of asymptomatic cases unknown
- 40,000-50,000 per year
- sexual transmission in developed countries
life cycle and pathophysiology
- feco-oral infection of cyst
- hutch in small intestine into trophozoite
- reside in large intestine
- propagate by binary fission
- some penetrate large intestine wall
- bloody diarrea
- trophozoites phagocityze RBC
- only RBC phagocitizing trophozoite means infection
- non-RBC-phagocitizing trophozoite means colonization
- some invade into portal vein through liver
- liver abscess
- some encyst in large intestine
- cysts are excreted from anus
morphology
- trophozoite 20-50 μm
- cyst has 4 nuclei, each nucleus has a nucleolus
Entamoeba dispar
- formerly named as E. histolytica in 1903
- non-pathogenic type of old E. histolytica was distinguished as E. dispar in 1925
distribution
- E. disper vs E. histolytica
- 3:1 in developing countries
- 10:1 in developed countries
