1. Epidemiology of amebiasis Dr. Nicolas Padilla Professor of Pediatrics and Researcher Nursing and Obstetrics School of Celaya University of Guanajuato

2. Introduction Amebiasis is a worlding disease. Principal frequency in countries with a deficiency in sanitary conditions. It is more frequent in tropical countries. Poorest areas.

3. Frequency

4. 10-20% of the world population. Colombia and Brazil 40%. Arabia 30%. Mexico 27%.

5. Mortality in Mexico 1980 23% 1998 < 1%

6. Entamoeba histolytica It was described more than 100 years ago. It has two forms: infectant (cyst) or vegetative (trophozoite).

7. Transmission Faeces- mounth Contaminated water Contaminated meals Street vendors of meals

8. Factors for the development of amebiasis For the ameba Phatogenicity of ameba, its virulence. Amebas pathogenic and non-pathogenic

9. Factors for the development of amebiasis For the host Nutritional status Age Sex Immunologic condition

10. Factors for the development of amebiasis For the environment Management of water Management of waste Habits nutritionals and hygienics

11. Chemoprophylaxis It is the method for to make prevention by chemical substance. It is used in Mexico, with albendazole, to control the diseases by plathelmyntes and nemathelmyntes.

12. Chemoprophylaxis Quinfamide

13. Studies on chemoprophylaxis In Mexico, administration of quinfamide each 3 months during one year, in children, had 12.5% of frequency of amebiasis.

14. Conclusions The chemoprophylaxis scheme is a line of control of amebiasis, but also, we should increase the personel hygienic habits, to avoid eat in the streets and, to avoid the fecalism.