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By John M. Watson and J. B. Stenlake (Auth.)

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Prevention involves keeping young animals in clean, dry conditions and avoiding over-crowding. Infection followed by recovery confers lasting immunity. , probably identical with T. gondii, cause a fatal syndrome in pigeons, sheep and, more rarely, other domestic animals. , probably identical with S. lindemanni, are pathogenic in domestic animals and poultry. Nosema bombycis causes pébrine in honey bees. 36 CHAPTER 3 HELMINTHOLOGY NATURE AND CLASSIFICATION PARASITIC WORMS OF Helminthology is the study of parasitic worms.

19 20 21 22 23 24 A B C D 1 2 3 4 Lowerfigure—ComparativeFeatures of Human Malaria Parasites in Blood. Plasmodium falciparum. Plasmodium malariae. Plasmodium ovale. Plasmodium vivax. Ring stages. Trophozoites. Segmenting forms. Gametocytes. 29 AN INTRODUCTION TO PARASITOLOGY P. vivax and P. ovale which cause benign tertian malaria (characterised by a febrile paroxysm every 48 hours). P. falciparum which causes malignant (pernicious) tertian malaria (characterised by febrile paroxysms at irregular intervals approximating to 48 hours in some cases).

Midges Posterior intestine (as P. pellucidus) Turkeys Plagiorchis megalorchis NOTOCOTYLIDAE 1. Snails 2. Dragonflies Posterior intestine (Bursa fabricii). Enter oviduct in laying birds Fowls, ducks PLAGIORCHIDAE Prosthogonimus pellucidus and other species of this genus Intestine Ducks Pigeons, ducks Parastrigea robusta Cotylurus cornutus Small intestine Intestine Pigeons, ducks Apatemon gracilis STRIGEIDAE Aquatic snails Small and large intestines Aquatic snails 1. Snails 2. , Carmyerius spp. Horses, pigs Gastrodiscus aegyptiacus Pigs (man) Gastrodiscoides hominis Paramphistomum cervi and related species Cotylophoron cotylophorum PARAMPmSTOMATIDAE Parasite TABLE 3 (continued) Comment Haemorrhagic enteritis— diarrhoea, anaemia Haemorrhagic enteritis—diarrhoea Not serious Not serious Mucosal irritation, diarrhoea, anaemia, weakness Not usually serious Southern Asia, but Fischoederius Far East said to be fatal in cattle Mucosal inflammation Pathogenic effects HELMINTHOLOGY generations in the tissues of the snail to reach the cercaria stage, which leaves the first intermediate host and penetrates beneath the scales of a fresh-water fish to encyst as a metacercaria in the superficial musculature.

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