By Gediminas Valkiunas
While learning the results of parasites on traditional populations, the avian haematozoa fulfills a number of the requisites of a great version. that includes a mess of tables and illustrations, Avian Malaria Parasites and different Haemosporidia summarizes greater than a century of study on poultry haemosporidians. for a very long time, poultry blood parasites served as very important types in learning human ailments. even though now mostly changed, the wealth of knowledge and study stay. With chapters addressing lifestyles cycles and morphology, pathogenicity, ultrastructure, geographical distribution, and illustrated keys to all identified species of the parasites, this e-book is a masterful review of the biology of poultry haemosporidian parasites.
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Additional info for Avian Malarial Parasites and Other Haemosporidia
There are different optimal temperatures for various species developing in the vector. Temperatures close to 25°C are optimal for P. relictum. The viability of sporozoites developed at higher temperatures decreases. Degeneration of the oocysts occurs, if the mosquitoes are kept at temperatures close to 4°C. At a temperature of about 24°C, the sporogony of P. relictum in Culex pipiens mosquito is completed in seven days after ingestion of mature gametocytes. When mature oocysts rupture, the sporozoites get into the haemocoele, penetrate into the salivary glands, where they locate extracellularly, intracellularly, and in the ducts of the glands.
They possess numerous roundish merozoites with a diameter of about 1 µm. The merozoites developed in megalomeronts penetrate into erythrocytes giving rise to the gametocytes. The prepatent period for the majority of the haemoproteids species studied varies within 11 days and three weeks. Only gametocytes develop in the blood cells (Fig. 6; Pl. II, 1–3). Infection of vertebrate hosts by subinoculation of infected blood is impossible due to the absence of merogony in the blood, except in the case when exoerythrocytic merozoites are present in the blood circulation.
Minutus and H. pallidus developed in vitro is 8 to 9 µm on average, while for H. tartakovskyi, it is 18 µm. Ookinetes (Figs. 8, 2; 9, 1–3) migrate through the epithelial layer of the midgut of the vector and round up under the basal lamina giving rise to oocysts (Fig. 8, 3). Sporogony of the species developing in biting midges and hippoboscid flies is not the same. The majority of the species of bird haemoproteids, whose life cycle has been studied, develop in biting midges. In this case, small oocysts (less than 20 µm in diameter) with one germinative center (Fig.
Avian Malarial Parasites and Other Haemosporidia by Gediminas Valkiunas