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Revista Brasileira de Parasitologia Veterinária

On-line version ISSN 1984-2961

Rev. Bras. Parasitol. Vet. vol.16 no.3 Jaboticabal July/Sept. 2007 




Tyzzeria parvula (Kotlan, 1933) Klimes, 1963 (Apicomplexa: Eimeriidae) in the greylag goose (Anser anser Linnaeus, 1758) in southeastern Brazil*


Tyzzeria parvula (Kotlan, 1933) Klimes, 1963 (Apicomplexa: Eimeriidae) no ganso cinzento (Anser anser Linnaeus, 1758)
no sudeste do Brasil


Bruno P. BertoI; Marcel TeixeiraII; Carlos Wilson G. LopesIII

ICurso de Pós-Graduação em Microbiologia Veterinária, Universidade Federal Rural do Rio de Janeiro (UFRRJ), km 7 da BR-465, Seropédica, RJ 23.890-000. E-mail:
IICurso de Pós-Graduação em Ciências Veterinárias, Universidade Federal Rural do Rio de Janeiro (UFRRJ), km 7 da BR-465, Seropédica, RJ 23.890-000. E-mail: - bolsista CNPq.
IIIDepartamento de Parasitologia Animal, Instituto de Veterinária, UFRRJ, km 7 da BR-465, Seropédica, RJ 23.890-000. E-mail: bolsista do CNPq.




Tyzzeria parvula from the greylag goose (Anser anser) is described in Southeastern Brazil. Oocysts are spherical to subspherical ranging from 12.4-180 to 10.7-15.9µm (15.4 X 13.4 µm), shape index 1.15, with a double layered wall 0.4 to 0.7 µm thick (n=20), outer smooth and colorless, inner pale greenish. Micropyle is absent, but oocyst residuum is present containing numerous granules and spherules. Surrounded by residuum there are eight sporozoites having one end round and other fine and slightly curved.

Key words: Tyzzeria parvula, oocysts, greylag goose, Anser anser.


Tyzzeria parvula é descrita no sudeste do Brasil em ganso doméstico, Anser anser. Os oocistos com parede constituída de duas membranas, a externa lisa e translúcida, e a interna verde pálido, variando de esféricos a subesféricos e sem micrópila. Os diâmetros, maior e menor mediram de 12,4 a 18,0 por 10,7 a 15,9µm (15,4 x 13,4µm) respectivamente com índice morfométrico de 1,15. Possuíam oito esporozoítas livres dentro do oocisto embebidos pelo corpo residual do oocisto. Uma das extremidades dos esporozoítas era arredondadas, enquanto a outra era estreita e levemente curvada.

Palavras-chave: Tyzzeria parvula, oocistos, ganso doméstico, Anser anser, Brasil.




The greylag goose, Anser anser L., 1758 is a waterfowl very common in Brazil. This species is worldwide, with an estimated global extend of occurrence of 1,000,00010,000,000 Km2 and population of 920,000-970,000 animals (BIRD LIFE INTERNATIONAL, 2006). In Europe and North America, A. anser and others species from the family Anatidae (A. albifrons, A. caurelensis, A. rossii, Branta canadensis and B. bernicla) are frequently found parasitized by the coccidian protozoan Tyzzeria parvula (Levine 1985; Arslan et al. 2002). Although T. parvula have been considered as the principal causative agent of intestinal coccidiosis in geese, the parasite has not been so far identified in Brazil.

The aim of this paper is to present the morphological description of sporulated oocysts of T. parvula from the greylag goose, A. anser, in southeastern Brazil.




Fecal samples (n=9) were collected from geese of a small farm located in the municipality of Rio de Janeiro, placed into plastic vials containing potassium dichromate solution (K2Cr2O7) at 2.5% 1:6 v/v and transported to Laboratório de Coccídios e Coccidioses, Projeto Sanidade Animal (Embrapa/UFRRJ), Departamento de Parasitologia Animal, Instituto de Veterinária da Universidade Federal Rural do Rio de Janeiro. To permit sporulation, the fecal material was filtrated with double gauze and placed on Petri dishes at laboratory temperature (23-28ºC) for ten days until most oocysts (70%) were sporulated. Oocysts for being studied were recovered from the feces using the saturated sugar flotation technique (DUSZYNSKY; WILBER 1997).


Morphological observations and measurements were performed using a binocular microscope Carl Zeiss with apochromatic oil immersion objective and micrometer ocular K-15X PZO (Poland). Line drawings were prepared with a binocular microscope Wild M-20 with drawing tube.


Pictures were prepared using a digital camera model CD Mavica MVC-CD250 Sony®, and a photographic camera f-KAS Automatic-2 with films ISO 100 (21 DINA) (Kodak, Mexico).

Cross transmission experiment

To determine the transmissibility of this specie from geese to ducks, two waterfowls one month old from the State of Rio de Janeiro and free of coccidia, Muskovy Duck (Cairina moschata) and Mallard (Anas platyrhynchus) were orally inoculated with 1,550 sporulated oocysts of T. parvula/500µL. Oocysts and the infective doses were prepared according to Eckert et al. (1995). After inoculation fecal observations were performed daily during ten days to observe the presence of oocysts in the feces.



Tyzzeria parvula (Kotlan, 1933) Klimes, 1963


Oocysts (Figures 1 and 2) are spherical to subspherical ranging from 12.4-18.0 to 10.7-15.9µm (15.4 X 13.4 µm), shape index 1.15, with a double layered wall 0.4 to 0.7 µm thick (n=20), being the outer smooth and colorless, and the inner pale greenish. Micropyle is absent, but oocyst residuum is present containing numerous granules and spherules. Surrounded by residuum there are eight sporozoites having one end round and other fine and slightly curved.





Taxonomic summary

Host: The greylag goose Anser anser (Anseriformes: Anatidae).

Synonymy: Eimeria parvula, Tyzzeria anseris.

Site of infection: not investigated.

Locality: Rio de Janeiro, Brazil.

Geographic distribution of the host: worldwide

Sporulation time: 4-7 days.

Type material and specimens deposited: oocysts in 10% formaldehyde-saline solution deposited at the Parasitology Collection. Laboratory of Coccidios e Coccidioses in the Department of Animal Parasitology, UFRRJ, Seropédica, Rio de Janeiro, Brazil. Repository number is P-013/2007, including phototypes and line drawings.

Cross transmissibility

Cairina moschata and A. platyrhynchus did not shed oocysts in the feces until ten days after inoculation.


None reported.



According to the data presented above the oocysts found in the Brazilian waterfowl A. anser belongs to the specie T. parvula. This parasite was first observed by Kotlán (1933) who named it as Eimeria parvula. Later, Allen (1936) working with the Mallard A. platyrhynchus observed the same type of oocysts and established the new genera Tyzzeria. Later, the specie was renamed by Nieschulz (1947) as T. anseris and by Klimes (1963) as T. parvula, this last accepted until now. After this T. parvula was found parasitizing some species of the Subfamily Anserinae around the world but unfortunately, as reported by Gajadhar et al. (1983), this coccidium in geese is still being referred to by old names. As reported by Nieschulz (1947), Klimes (1963) and Svanbaev and Rakhmatullina (1967), the coccidium described here is not transmissible from geese to ducks.



ALLEN, E.A. Tyzzeria perniciosa gen. et sp. nov., a coccidium from the small intestine of Pekin Duck, Anas domesticus L. Archiv für Protistenkunde, v. 87, p. 262-267, 1936.         [ Links ]

ARSLAN, M.O.; GICIK. Y.; ÖZCAN, K. The Frequency of Eimeriidae Species in the Domestic Geese in Kars Province of Turkey. Acta Protozoologica, v. 41, n.4, p. 353-357, 2002.         [ Links ]

BIRD LIFE INTERNATIONAL Anser anser. In: IUCN 2006. Red list of Threatened Species. Disponible on: <http://>. Acess: 25 jan. 2007.         [ Links ]

DUSZYNSKI, D.W.; WILBER, P.G. A guideline for the preparation of species descriptions in the Eimeridae. Journal of Parasitology, v. 83, n. 2, p. 333-336, 1997.         [ Links ]

ECKERT, J.; BRAUN, R.; SHIRLEY, M.; COUDERT, Biotechnology. Guidelines on techniques in coccidiosis research, cost 89/820. Luxembourg: Office for Official Publications of the European Communities, 1995. 300p.         [ Links ]

GAJADHAR, A.A.; WOBESER, G.; STOCKDALE, P.H.G. Coccidia of domestic and wild waterfowl (Anseriformes). Canadian Journal of Zoology, v. 61, n. 1, p. 1-24, 1983.         [ Links ]

KLIMES, B. Coccidia of the domestic goose (Anser anser dom.). Zentralblatt für Veterinäermedizine, Reiche B, v. 10, p. 427-448, 1963.         [ Links ]

KOTLÁN, S. Zur Kenntinis der Kokzidiose des Wassergeflügels. Die Kokzidieose der Hausgans. Zentralblatt für Bakteriologie Parasitenkunde und Infektionskrankheiten, v. 129, n. 1, p. 11-21, 1933.         [ Links ]

LEVINE, N.D. Veterinary Protozoology. 1ª ed. Ames: Iowa State University Press, 1985. 414 p.         [ Links ]

NIESCHULZ, O Eine neue Kokzidienart bei der Haungs (Tyzzeria anseris). Zentralblatt für Bakteriologie, Parasitenkunde und Infektionskraine, v.152, p. 74, 1947.         [ Links ]

SVANBAEV, S.; RAKHMATULLINA, N. 1967. New kind of coccidia of wild ducks. Farm News Science, v. 10, n. 1, p. 46-52, 1967.         [ Links ]



Received on March 12, 2007
Accepted for publication on July 10, 2007.



* Supported by CNPq.

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