Experimental Studies on the Biology of Capillaria obsignata Madsen, 1945, a Nematode Parasite of the Domestic Fowl

1965 ◽  
Vol 39 (4) ◽  
pp. 399-412 ◽  
Author(s):  
D. Wakelin
Keyword(s):  
Domestic Fowl ◽  
Experimental Studies ◽  
Ultra Violet ◽  
Food Conversion ◽  
Ultra Violet Radiation ◽  
Large Numbers ◽  
Host Parasite Relationship ◽  
Parasite Relationship ◽  
Host Parasite ◽  
Violet Radiation

The life history and biology of C. obsignata in the domestic fowl is described and discussed, together with aspects of the host-parasite relationship. The development of the eggs is shown to be influenced by temperature, humidity, ultra violet radiation and other environmental conditions and these are related to the epidemiology of the parasite. The fowl is susceptible to the development of large numbers of worms, but shows some reaction to very large infective doses. The numbers of worms developing in the host are influenced by the size of the infection and by the age of the host. Large infections produce a consistent depression in weight gain and reduce the efficiency of food conversion. Pathological changes arising from experimental infections are described and compared with those observed in natural infections.

The Significance of Infra-specific Variations of Hosts and Parasites in the Epidemiology of Helminths of Medical Importance

1971 ◽  
Vol 45 (4) ◽  
pp. 327-335 ◽  
Author(s):  
G. Webbe
Keyword(s):  
Genetic Heterogeneity ◽  
Experimental Studies ◽  
Parasitic Infections ◽  
Host Parasite Relationship ◽  
Parasite Relationship ◽  
Medical Importance ◽  
Host Parasite

The epidemiology of parasitic infections may be profoundly influenced by infra-specific variations in infectivity for either intermediate or definitive hosts. Such variations will decide the basic ecology of the host-parasite relationship, and variations in virulence and pathogenicity therefore determine different patterns of disease. While some of the evidence of infra-specific variations has been derived from experimental studies, much of it has been recorded by those concerned with investigations of the epidemiology and transmission of parasitic infections and the practical aspects of their control. The unequivocal demonstration of genetic heterogeneity of certain parasites of medical importance has therefore resulted in a better understanding of their epidemiology and, in some cases, is leading to greater precision in attempts to control them.

Further Studies on the Development of Cysticercus fasciolaris and Cysticercus pisiformis, with special reference to the Growth and Sclerotization of the Rostellar Hooks

1948 ◽  
Vol 22 (3-4) ◽  
pp. 179-198 ◽  
Author(s):  
Hilary Crusz
Keyword(s):  
Special Reference ◽  
Developmental Stages ◽  
Experimental Studies ◽  
Polarized Light ◽  
Differential Staining ◽  
Cysticercus Fasciolaris ◽  
Host Parasite Relationship ◽  
Parasite Relationship ◽  
Histochemical Tests ◽  
Host Parasite

The previous observations of the author and others on the development ot Cysticercus fasciolaris and C. pisiformis have been confirmed and amplified by experimental studies, and the developmental processes of the two forms are compared. While definite information has been obtained on the age of the various developmental stages, there is considerable variation due to the subtleties of the host-parasite relationship.The study of the development of the rostellar hooks of taeniids has been extended by the use of differential staining, histochemical tests and polarized light, and new facts, such as the chemical and optical differences existing between cuticle and hooklets and between blade and base of hooks, have been brought to light.

Ultra-Violet Radiation and Varicose Ulcers

BMJ ◽  
1927 ◽  
Vol 2 (3479) ◽  
pp. 472-472
Author(s):  
M. Weinbren
Keyword(s):  
Ultra Violet ◽  
Ultra Violet Radiation ◽  
Violet Radiation

Ultra-Violet Radiation and the Production of Twins and Double Monsters

1931 ◽  
Vol 4 (3) ◽  
pp. 461-485 ◽  
Author(s):  
Marie A. Hinrichs ◽  
Ida T. Genther
Keyword(s):  
Ultra Violet ◽  
Ultra Violet Radiation ◽  
Violet Radiation

Susceptibilities of Various Snail Intermediate Hosts of Schistosoma mansoni to Different Strains of the Parasite

1965 ◽  
Vol 39 (4) ◽  
pp. 363-376 ◽  
Author(s):  
M.F.A. Saoud
Keyword(s):  
Puerto Rico ◽  
Schistosoma Mansoni ◽  
Intermediate Hosts ◽  
Considerable Evidence ◽  
The Past ◽  
Host Parasite Relationship ◽  
Parasite Relationship ◽  
Different Strains ◽  
Host Parasite ◽  
Comprehensive Studies

In the past two decades, considerable evidence has accumulated in the literature about the differences in the susceptibility of various intermediate hosts of Schistosoma mansoni to different strains of the parasite. Comprehensive studies on this aspect of host-parasite relationship have been published by Files & Cram (1949), Abdel-Malek (1950) and Files (1951). The results of more recent studies have been reported by Wright (1962) and Saoud (1964).In the present paper, the writer has studied the susceptibility of four intermediate hosts of S. mansoni from Brazil, Puerto Rico, Egypt and Tanganyika to some strains of the parasite.

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