Bephenium hydroxynaphthoate against Heterophyes heterophyes infections.
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Nine species of nematodes, unidentified larval nematodes, three species of trematodes, two species of acanthocephalans and a single species of chewing louse were collected from 1993 to 1995 from 25 introduced whooping cranes (Grus americana) in Florida (USA). In spite of a quarantine procedure involving anthelmintic therapy, three helminth parasites may have been introduced from captive populations. Other parasites acquired were similar to those found in a local congener, the Florida sandhill crane (Grus canadensis pratensis), or only occurred infrequently.
Approximately 11,000 heterophyid trematodes, Crytocotyle lingua, were recovered from the small intestine of a bald eagle, Haliaeetus leucocephalus, in Nova Scotia. Severe emaciation of the eagle was attributed to the heavy burden of trematodes. The wide distribution of this trematode in the Maritime area and the fact that fish are a primary source of food for eagles in Nova Scotia might be predisposing factors in this case.
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Total serum IgE was measured by a semi-automated enzyme immunoassay on sera from normal and disease groups. Data from this investigation was analyzed in respect of precision, linearity, sensitivity and correlation with other test methods. Using human serum pools having values between 7 and 480 IU/ml, the intra-assay coefficient of variation ranged from 3.3 to 14.6% with an arithmetic mean of 6%. The inter-assay coefficient of variation on commercially supplied control sera ranged from 4.4 to 14.2%. In addition, tests were carried out on serially diluted samples to assess the linearity of the method, and on sera with IgE levels of less than 5 IU/ml in order to assess its sensitivity. It was shown that the technique being assessed was unaffected by the presence of lipid or haemoglobin or by the addition of bilirubin or any one of 46 commonly prescribed drugs each at double its toxic dose. There was good correlation between the semi-automated enzyme immunoassay technique and four other methods used during this study. This technique exhibits excellent specificity, reproducibility and a sensitivity well within clinical demands.
Parasitism in waterfowl is a very common phenomenon. Two detailed check lists of helminth parasites of waterfowl are available (Lapage, 1961; McDonald, 1969) and many of these parasites are reported to occur in domestic ducks. However, the pathological significance of most of them is unclear. In a preliminary study, Qadir (1979) recorded 13 species of helminths from domestic ducks of Bangladesh. The present paper reports on the prevalence and pathological effects of helminth infections in domestic ducks (Anas platyrhynchos domesticus) of Bangladesh under natural conditions and on their incidence in two age and sex groups of ducks.
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Using data sets derived from published literature, the contribution of congeneric species to helminth component community richness is evaluated. Consideration of the frequency distribution of congeners in relation to host and parasite groups reveals that the distributions are unimodal, that singletons are the commonest class and that the frequency of occurrence of congeners decreases with increasing number of species per genus. Congeners may be found in any group of hosts or parasites, but are more common amongst cestodes of aquatic birds. Two patterns of occurrence of congeneric species are recognized: one in which from a few to multiple congeners are found within a single helminth genus, exemplified by dactylogyrid monogeneans and cloacinid nematodes, and the other in which there is a simultaneous occurrence of congenerics and confamilials such that there are several genera involved, but each represented by fewer species, exemplified by strongyles in horses. The question of whether these patterns can be considered examples of species flocks is discussed. We conclude that multiple congeners and species flocks are interesting phenomena but, except in isolated cases, they make insignificant contributions to community richness.
Parasitic infections, although common in tropical and subtropical regions, are prevalent worldwide because of changing immigration patterns and in international travel. The burden of worm infection is enormous and the intensity of infection is usually high among the poor and in immunocompromised individuals. Pulmonary eosinophilia occurs in almost all metazoan infections. In the Western world, the most common infections are caused by Strongyloides, Ascaris, Toxocara, and Ancylostoma species. Most of the nematodes multiply within the human host and cause pulmonary eosinophilia during larval migration through the lungs. Despite larval migration through the lungs, there is usually no permanent lung damage. The result is an increased number of eosinophils in the airways or lung parenchyma with or without peripheral eosinophilia. Löffler's syndrome, visceral larva migrans, and tropical pulmonary eosinophilia are the most common infections that cause pulmonary eosinophilia. The most serious parasitic eosinophilic lung disease is tropical pulmonary eosinophilia, a disorder caused by the filarial worms Wuchereria bancrofti and Brugia malayi, in which cases have typically been reported to masquerade acute or refractory bronchial asthma. Increasing awareness, newer diagnostic techniques, preventative measures, and antiparasitic drugs are important in reducing the worldwide morbidity and mortality from parasitic helminths and protozoa. This review focuses on common and some uncommon causes of pulmonary parasitic eosinophilia and their manifestations, diagnosis, and management.
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A study of anthelmintic treatments received by 40,000 cattle during 1978 on a random sample of 240 farms in England and Wales showed that most were given against gastrointestinal nematodes for purposes of prophylaxis. Analysis of the data indicates that of an estimated pounds 15m spent on anthelmintics and their administration, most was far less effectively employed than it might have been. Errors of three kinds were common, some classes of cattle being dosed unnecessarily, animals being dosed at an unfavourable occasion or time of year, and anthelmintics being directed at parasites against which they had no action. Existing knowledge on the control of helminths is not effectively used; most dosing was done without advice from an identifiable source.
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Most disease problems affecting farmed salmonid fish are either caused or exacerbated by bad husbandry and poor environmental conditions. The aspects of water quality and nutrition which are significant in causing husbandry problems are considered. The clinical aspects of these diseases are decribed in terms of the life cycle of salmonids, and methods of prevention are discussed.
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