This document defines key terms related to parasitology and provides information about Entamoeba histolytica. It defines parasites, hosts, infection, and infestation. It also outlines the divisions of parasitology including protozoology, which is the study of protozoa like Entamoeba histolytica. The document describes the lifecycle and transmission of E. histolytica, noting it can be transmitted via the fecal-oral route or sexually. Clinical presentation and risk factors are also summarized, including poor sanitation and contamination of food/water.

11. DEFINITIONS
 PARASITE:
Living organism which lives in or upon and at the expense of
another living organism.
 SAPROPHYTE
Living organisms who derive their nourishment from dead
material.

12.  DEFINITIVE HOST (Primary host)
It is the host which harbors the adult stage of
parasite or where the parasite utilizes the sexual
method of reproduction
 INTERMEDIATE HOST (Secondary host)
It is the host which harbors the larval stage of the
parasite or where the parasite utilizes the asexual
method of reproduction

13.  INFECTION:
Parasite establishes itself within the host
 INFESTATION
When the parasite lives on the surface of the host

14. PARASITOLOGY
PROTOZOOLOGY
HELMINTHOLOGY

15. PROTOZOA
 Rhizopoda
1. Entamoeba Histolytica
2. Endolimax nana
3. Iodoamoeba Butschii
4. Dientamoeba fragilis
 Sporozoa
1. Plasmodium
2. Toxoplasma
 Mastigophora
1. Giardia lamblia
2. Trichomonas
3. Leishmania
4. Trypanosome
 Ciliata
1. Balantidium Coli

20. Protozoology
ENTAMOEBA HISTOLYTICA

21. PROTOZOA



22. PROTOZOA
 isthestructurethat is abletofeed, growandmove. Butit can
lose itsabilityinunfavorable conditions,.
 arehardorthickwalls, resistanttoadverse conditions, non-
nutritiousandnon-growingforms

23. 1. Cystic
2. Non cystic (vegetative/trophozoite)

24. WHO definition “Amoebiasis”
 Harboring the parasite Entamoeba histolytica
Entamoeba
histolytica
Intestinal Extra
Liver
Without
signs
Clinical

25. Epidemiology

26. habitat

28. Reservoir of infection

29. Epidemiological factors
Host factors
 Age
 Gender
 Household infections
 Food handlers
Environmental factors
 Poor sanitation
 Night soil as fertilizers
 Human defecation in fields
 Sewage contamination
 Floods
 Heavy rains

33. Clinical presentation

34. MODE OF TRANSMISSION
1. FEACO – ORAL ROUTE
2. VECTOR TRANSMISSION
3. Sexual route
 INCUBATION PERIOD
2 – 4 WEEKS

35. Carrier of antamoeba histolytica

37. PREVENTION & CONTROL

38. Any Question ?