By John M. Watson and J. B. Stenlake (Auth.)
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Extra resources for An Introduction to Parasitology
Eventually the cyst bursts and the sporozoites are liberated into the haemocoele or body cavity of the mosquito, through which they make their way forwards to the salivary glands, there to lie in wait for an opportunity to invade a new human host when the infected mosquito bites again. In addition to the typical paroxysms, involving fever and rigor, which coincide with the bursting of infected erythrocytes and the discharge of merozoites and toxic metabolic by-products into the blood plasma, malaria is characterised by anaemia (resulting from destruction of red blood corpuscles) and by enlargement of the spleen.
Typical trypanosome. Trypanosoma gambiense in blood of host. Leishmania donovani—aflagellate forms in an endothelial cell. Leishmania tropica—flagellate forms from culture. 12 —cyst. AN INTRODUCTION TO PARASITOLOGY severe in turkeys. Transmission is by direct contamination of food, as with other intestinal parasites, but can also occur by introduction of the parasite with the eggs of the nematode worm Heterakis gallinae. A number of other species of intestinal flagellates occur in domestic animals, but none of them are proven pathogens.
America, Europe Europe, India Inflammation of bile- Malay States, ducts, hepatomegaly, British Guiana, Brazil loss of appetite, death Inflammation and Eastern Asia, occlusion of Brazil infected ducts, poor condition See above Pathogenic effects AN INTRODUCTION TO PARASITOLOGY two sporocyst generations to reach the cercarial stage. The cercariae leave the snail during rainy weather in masses of mucus known as slime-balls, and must then be ingested by a second intermediate host, the common brown ant, Formica fusca.
An Introduction to Parasitology by John M. Watson and J. B. Stenlake (Auth.)