The Study of Coccidiosis (Eimeria Caviæ [Sheather 1924]) in the Guinea Pig

Lapage, G.

doi:10.1016/s0372-5545(17)35007-1

Cited by 7 publications

(5 citation statements)

References 7 publications

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“…19). As described for other species of Eimeria by Hosoda (1928), Roudabush (1937), and Lapage (1940), the outer layer stained red with Heidenhain's azan, while the inner layer stained yellow or orange. 20).…”

Section: Sexual Stagessupporting

confidence: 66%

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The Endogenous Phase of the Life Cycle of Eimeria bovis

Hammond¹,

Bowman²,

Davis³

et al. 1946

The Journal of Parasitology

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Section: Sexual Stagessupporting

confidence: 66%

“…Thus, the process of nuclear division as well as the structure of the nucleus closely resembles that described for E. caviae by Lapage (1940). Division occurs by elongation of the karyosome and separation into two parts, sometimes equal in size and sometimes unequal.…”

Section: Development Of Schizontssupporting

confidence: 63%

The Endogenous Phase of the Life Cycle of Eimeria bovis

Hammond¹,

Bowman²,

Davis³

et al. 1946

The Journal of Parasitology

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“…The nuclei of the schizonts consist of a deeply staining karyosome, eccentrically placed in a lighter staining material, presumably plastin, and surrounded by an unstained 'halo' of nucleoplasm (Tyzzer, 1929;Lapage, 1940).…”

Section: Resultsmentioning

confidence: 99%

Life history and pathogenicity of Eimeria adenoeides Moore & Brown, 1951, in the turkey poult

Clarkson¹

1958

Parasitology

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The life cycle and pathogenicity of a strain of Eimeria isolated in Great Britain from turkey poults by single cell inoculation are described and, using the criteria laid down by Tyzzer, the species is identified as E. adenoeides.The life cycle is of the same general pattern as in other Eimeria species, consisting of two asexual and one sexual generations.The organism is highly pathogenic for young poults, a dose of 200,000 oocysts producing 100 % mortality in 3-week-old birds and smaller doses causing reduced weight gain. Birds 11 weeks old resisted a dose of 3 million oocysts.The gross and microscopic pathology of the infection is described. No changes were found in the blood picture.

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“…This view, endorsed by Henry (1932) and Lapage (1940), is also expressed in textbooks of protozoology such as that of Wenyon (1926). It is possible that the care taken in the maintenance of laboratory guinea-pigs in recent years has resulted in a decrease in the incidence of infection.…”

Section: Discussionmentioning

confidence: 84%

Coccidiosis in guinea-pigs

Ellis¹,

Wright²

1961

J Clin Pathol

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SYNOPSISThe attention of laboratory workers is drawn to the possibility of coccidiosis as a cause of death in guinea-pigs. The purchase of a number of guinea-pigs infected with this protozoon was followed by 12 deaths when these animals were injected with material for diagnostic purposes. No deaths occurred in the laboratory stock herd, as these were kept separate from the newcomers and were not infected.The life history of the parasite is described, together with the post-mortem findings in our series of animals. MATERIAL AND METHODSBecause of an increase in the number of requests for biological examinations in April 1960, a stock of guinea-pigs was purchased and used without a preliminary quarantine period. These animals received an intramuscular injection into the right thigh of material such as uterine curettings, urine, or milk, and of those injected 12 subsequently died. All the deaths occurred among the imported animals and followed a brief illness in which diarrhoea was the principal symptom. The imported guinea-pigs were kept separate from the laboratory stock and no deaths or illness occurred in the latter group. POST-MORTEM EXAMINATIONPost-mortem examination, together with bacteriological investigations, were performed on all guinea-pigs dying and, in addition, material was frozen and kept in case virological examination might be required.Direct wet preparations of faeces were examined for parasites and cysts were sought for after concentration by the salt flotation method.Material for histological examination was fixed in formalin and sections were stained by haematoxylin and eosin. A comprehensive histological examination was performed on only three of the guinea-pigs. RESULTSGROSS APPEARANCE OF ORGANS The visceral peritoneum was congested and there was bloodstained fluid in the peritoneal cavity. White patches on the outer surface of the colon were taken to be patches of lymphoid tissue. BACTERIOLOGY Bacteriological examination wasReceived for publication 13 October 1960. negative and in view of the findings described below virological studies were not undertaken.HISTOLOGY The only abnormal findings outside the intestional tract were areas of pulmonary collapse.The visceral peritoneum and mesentery in relation to the gut showed a non-specific inflammatory infiltration consisting of a mixture of polymorphs and chronic inflammatory cells.The whitish patches on the colon were areas of lymphoid tissue, some of which showed ulceration with a surrounding inflammatory reaction. Ulceration appeared particularly liable to occur within small mucosal diverticuli and, in sections not passing through the opening of the diverticulum, produced the appearance of abscess cavities lying within the submucosa. The mucosa of the colon near these lesions contained enormous numbers of cysts measuring 18 x 15 ,u which were indentified as the oocysts of the protozoal parasite Eimeria caviae. The cysts had a well-defined capsule and contained a mass of granular cytoplasm.In one case no ulceration was found and only a few...

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The Study of Coccidiosis (Eimeria Caviæ [Sheather 1924]) in the Guinea Pig

Cited by 7 publications

References 7 publications

The Endogenous Phase of the Life Cycle of Eimeria bovis

The Endogenous Phase of the Life Cycle of Eimeria bovis

Life history and pathogenicity of Eimeria adenoeides Moore & Brown, 1951, in the turkey poult

Coccidiosis in guinea-pigs

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