scholarly journals Eosinophils are dispensable for the regulation of IgA and Th17 responses in Giardia muris infection

2020 ◽  
Author(s):  
Ivet A. Yordanova ◽  
Martin Lamatsch ◽  
Anja A. Kühl ◽  
Susanne Hartmann ◽  
Sebastian Rausch
Keyword(s):  
Giardia Muris

Survival of giardia, cryptosporidium, poliovirus and salmonella in marine waters

1997 ◽  
Vol 35 (11-12) ◽  
pp. 261-268 ◽  
Author(s):  
D. C. Johnson ◽  
C. E. Enriquez ◽  
I. L. Pepper ◽  
T. L. Davis ◽  
C. P. Gerba ◽  
...  
Keyword(s):  
Water Quality ◽  
Salmonella Typhimurium ◽  
Cryptosporidium Parvum ◽  
Common Method ◽  
Waterborne Pathogens ◽  
Protozoan Parasites ◽  
Marine Waters ◽  
Untreated Sewage ◽  
Cryptosporidium Parvum Oocysts ◽  
Giardia Muris

Discharge of sewage into the ocean is still a common method of disposal worldwide. Both treated and untreated sewage may contain significant concentrations of waterborne pathogens, such as Giardia, Cryptosporidium, poliovirus and Salmonella. Limited studies exist on the survival of poliovirus and Salmonella in marine waters; however, almost no information exists on the survival of protozoan parasites in marine waters. This study examined the survival of Giardia muris cysts, Cryptosporidium parvum oocysts, poliovirus-1 and Salmonella typhimurium in marine waters. The survival of the microorganisms varied according to the presence of light, salinity and water quality (as determined by quantity of enterococci). All microorganisms survived longer in the dark than in sunlight, the order of survival in sunlight being: Cryptosporidium > poliovirus > Giardia > Salmonella.

Effect of initial microbial density on inactivation of Giardia muris by ozone

2003 ◽  
Vol 37 (12) ◽  
pp. 2980-2988 ◽  
Author(s):  
Charles N. Haas ◽  
Baris Kaymak
Keyword(s):  
Microbial Density ◽  
Giardia Muris

Interactions between the intestinal flagellates Giardia muris and Spironucleus muris and the blood parasites Babesia microti, Plasmodium yoelii and Plasmodium berghei in mice

Parasitology ◽  
1982 ◽  
Vol 85 (1) ◽  
pp. 101-110 ◽  
Author(s):  
Sara J. Brett ◽  
F. E. G. Cox
Keyword(s):  
Small Intestine ◽  
Total Duration ◽  
Plasmodium Yoelii ◽  
Blood Parasite ◽  
Blood Parasites ◽  
Babesia Microti ◽  
Parasite Infections ◽  
Immunological Factors ◽  
Temporary Decrease ◽  
Giardia Muris

SUMMARYIn mice infected with the intestinal flagellates Giardia muris or Spironucleus muris, together with the blood parasites Babesia microti or Plasmodium yoelii, there is a temporary decrease of flagellate cyst output coincident with the peak of the blood parasite infections, followed by a rapid return to normal levels. This decrease in cyst output is correlated with decreased numbers of trophozoites in the small intestine. The effect on S. muris is more marked than that on G. muris. Neither blood parasites has any effect on the total duration of the flagellate infection and the flagellates do not affect the blood parasites. In mice infected with G. muris or S. muris and P. berghei there is also a decrease in cyst output but this is less apparent than in infections with B. microti or P. yoelii because of the fatal nature of the P. berghei infection. It is suggested that the decrease in cyst output is probably due to changes in the contents of the small intestine or to non-specific immunological factors rather than to specific immunological changes.

Batch solar disinfection inactivates oocysts of Cryptosporidium parvum and cysts of Giardia muris in drinking water

2006 ◽  
Vol 101 (2) ◽  
pp. 453-463 ◽  
Author(s):  
K.G. McGuigan ◽  
F. Mendez-Hermida ◽  
J.A. Castro-Hermida ◽  
E. Ares-Mazas ◽  
S.C. Kehoe ◽  
...  
Keyword(s):  
Drinking Water ◽  
Cryptosporidium Parvum ◽  
Solar Disinfection ◽  
Giardia Muris

scholarly journals Sanitary profile in mice and rat colonies in laboratory animal houses in Minas Gerais: I - Endo and ectoparasites

2007 ◽  
Vol 59 (6) ◽  
pp. 1478-1484 ◽  
Author(s):  
K.A. Bicalho ◽  
F.T.M. Araújo ◽  
R.S. Rocha ◽  
O.S. Carvalho
Keyword(s):  
Physical Environment ◽  
Minas Gerais ◽  
Public Institutions ◽  
Hymenolepis Nana ◽  
Syphacia Muris ◽  
Syphacia Obvelata ◽  
Animal House ◽  
Aspiculuris Tetraptera ◽  
Giardia Muris ◽  
Sanitary Conditions

The sanitary conditions of 13 animal houses in nine public institutions in Minas Gerais, and the presence of endo and ectoparasites of mice and rats colonies kept in these facilities were evaluated. Data about barriers to prevent the transmission of diseases and a program of sanitary monitoring were obtained through a questionnaire and local visit. Parasitological methods were performed for diagnosing mite, lice, helminthes, and protozoa parasites in 344 mice and 111 rats. Data have shown that the majority of the animal houses had neither proper physical environment nor protection barriers to prevent the transmission of infections. Parasitological results have shown that only one animal house (7.7%) had parasite free animals, whereas the others have presented infected animals and the prevalences of parasites in the mice colonies were: Myobia musculi (23.1%); Myocoptes musculinus (38.5%); Radfordia affinis (15.4%); Syphacia obvelata (92.3%); Aspiculuris tetraptera (23.1%); Hymenolepis nana (15.4%); Spironucleus muris (46.2%); Giardia muris (46.2%); Tritrichomonas muris (53.8%); Trichomonas minuta (61.5%); Hexamastix muris (7.7%); and Entamoeba muris (84.6%). As for the rat colonies, the prevalences were: Poliplax spinulosa (8.1%); Syphacia muris (46.2%); Trichosomoides crassicauda (28.6%); Spironucleus muris (85.7%); Tritrichomonas muris (85.7%); Trichomonas minuta (85.7%); Hexamastix muris (14.3%) and Entamoeba muris (85.7%).

scholarly journals Giardia muris and Giardia duodenalis groups: ultrastructural differences between the trophozoites

1989 ◽  
Vol 31 (4) ◽  
pp. 242-247 ◽  
Author(s):  
Maria Inês L. Sogayar ◽  
Elisa Aparecida Gregório
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Giardia Duodenalis ◽  
Dorsal Surface ◽  
Distal Extremity ◽  
Transmission Electron ◽  
Marginal Plate ◽  
Marginal Plates ◽  
Giardia Muris ◽  
Rats And Mice

Trophozoites of the Giardia muris group from hamsters, domestic rats and mice and of the Giardia duodenalis group from hamsters and domestic rats were examined by transmission electron microscopy. The basic ultrastructure of the trophozoites was similar. Differences were shown in the morphology of the ventrolateral flange of the trophozoites of Giardia muris and Giardia duodenalis groups. Marginal plates are less developed in the species of the Giardia duodenalis group. In this group, the distal extremity of the lateral flange is short and thick and the marginal plate does not penetrate into the distal extremity of the flange. In the Giardia muris group, the ventro-lateral flange is well developed and narrow and the marginal plate penetrates the distal extremity of the flange. The osmiophilic lamella, which accompanies the dorsal surface of the marginal plate is seen only in the Giardia muris group.

scholarly journals Arrangement of subunits in microribbons from Giardia

1981 ◽  
Vol 47 (1) ◽  
pp. 167-185 ◽  
Author(s):  
D.V. Holberton
Keyword(s):  
Inner Core ◽  
Giardia Duodenalis ◽  
Optical Diffraction ◽  
Third Order ◽  
The Third ◽  
Face Images ◽  
Face View ◽  
Diffraction Patterns ◽  
Vertical Spacing ◽  
Giardia Muris

Ultrasound has been used to disperse the cytoplasm of Giardia muris and Giardia duodenalis trophozoites, releasing disk cytoskeletons for negative staining and study by electron microscopy. Sonication also breaks down the corss-bridges uniting microribbons in disks. Individual ribbons and small bundles of these structures, are found in these preparations and have been imaged both from their edges and in flat face view. The outer layers of ribbons are 2 sheets of regularly arranged globular subunits, held apart by a fibrous inner core. The axial repeat of the microribbon is 15 nm, which is also the distance separating cross-bridge sites along ribbons. Pronounced striping at this interval is a feature of ribbon faces where they are joined in bundles. Subunits in the outer layer are arranged in vertical protofilaments that are set orthogonally to the long axis of the ribbon. Protofilaments bind tannic acid and are seen clearly in sectioned ribbons. Three protofilaments fit into the 15-nm longitudinal spacing. Optical diffraction patterns from ribbon images are dominated by orders of the 15-nm periodicity, including the third-order reflexions expected from protofilaments spacings. Fourth-order reflexions indicate that the ribbon core may also be structured. Ribbon face images give rise to a strong 4-nm layer line, corresponding to the vertical spacing of subunits in protofilaments. Neighbouring protofilaments are staggered by about 0.67 nm. The lattices found in ribbons are consistent with studies of cytoskeleton composition.

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