2015م - 1444هـ
نبذه عن الكتاب:



Blood & Tissue Protozoa – The Hemoflagellates

A. Introduction

1. The family Trypanosomatidae, (includes hemoflagellates) contain only two

genera that parasitize humans.

a. Genus Leishmania are always intracellular, principally in cells of the

reticuloendothelial system.

b. Genus Trypanosoma contains members that may be found both in the

circulating blood and intracellularly in cardiac muscle. African - blood;

American - cardiac muscle.

2. In all probability, the hemoflagellates were originally parasites of insects. They

are transmitted by insects, and in them undergo a developmental cycle (the

arthropod serves as intermediate host).

a. "Old World” leishmaniasis - transmitted by the bite of various species of

sandflies of the genus Phlebotomus.



b. South American leishmaniasis - carried by Lutzomyia spp. sandflies.

c. American trypanosomiasis - transmitted by reduviid bugs; transmission

occurs when infective feces of the bug contaminates the wound made by

the insect's bite or an abrasion of the skin