Chapter 29


Introduction to Parasitology



1. Entry of organisms occurs primarily by ingestion or direct penetration of the skin (sometimes by bite of insect vector).

2. Replication of parasites takes place in specific cell types or organs.

3. Cell and tissue damage result from four general mechanisms.

4. Immune escape

Disease manifestations



Treatment (Table 29-1)

II Protozoan Parasites (Table 29-2)

Intestinal and urogenital protozoa

1. Cryptosporidium species

2. Entamoeba histolytica

3. Giardia lamblia

4. Trichomonas vaginalis

Blood and tissue protozoa

1. Leishmania species

2. Plasmodium species

• Malaria

a. Characterized by episodic paroxysms of high fever and severe chills followed by sweats

b. Life cycle of plasmodia within humans includes an exoerythrocytic phase within hepatocytes and a series of erythrocytic cycles within red blood cells (RBCs) (Fig. 29-2).

Jun 18, 2016 | Posted by in IMMUNOLOGY | Comments Off on Parasites

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