Influence of Refrigeration and Formalin on the Floatability of Giardia duodenalis Cysts
Mem. Inst. Oswaldo Cruz
; 94(4): 571-4, July-Aug. 1999. tab
Article
em En
| LILACS
| ID: lil-241574
Biblioteca responsável:
BR1.1
RESUMO
Giardia duodenalis cysts obtained from fresh fecal samples, fecal samples kept under refrigeration and fecal samples treated with formalin were studied as to their floatability on sucrose solutions with the following specific gravities 1,040 kg/m3; 1,050 kg/m3; 1,060 kg/m3; 1,070 kg/m3; 1,080 kg/m3; 1,090 kg/m3; 1,100 kgm3; 1,150 kg/m3; 1,200 kg/m3; and 1,250 kg/m3, contained within counting-chambers 0.17 mm high. Cysts that floated on and those settled down as sediments were counted, and had their percentages estimated. Sucrose solutions of 1,200 kg/m3 specific gravity (the average specific gravity of diluting liquids employed in floatation techniques) caused to float 77.7 percent, 78.4 percent and 6.6 percent of the G. duodenalis cysts obtained, respectively, from fresh fecal samples, fecal samples kept under refrigeration, and fecal samples treated with formalin. Cysts obtained both from fresh fecal samples and fecal samples kept under refrigeration presented similar results concerning floatability. It was observed, however, that the treatment of feces with formalin diminished the cysts floatability under the various specific gravities studied. This results should influence, the recommendations for transport and storage of fecal samples used for parasitological coproscopy
Texto completo:
1
Índice:
LILACS
Assunto principal:
Refrigeração
/
Manejo de Espécimes
/
Giardíase
/
Fezes
/
Giardia
Tipo de estudo:
Guideline
Limite:
Animals
/
Humans
Idioma:
En
Revista:
Mem. Inst. Oswaldo Cruz
Assunto da revista:
MEDICINA TROPICAL
/
PARASITOLOGIA
Ano de publicação:
1999
Tipo de documento:
Article