Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/130986
Title: In vitro encystment and experimental infections of Blastocystis hominis
Authors: Suresh, K.
Ng, G.C.
Ramachandran, N.P.
Ho, L.C.
Yap, E.H. 
Singh, M.
Issue Date: 1993
Citation: Suresh, K., Ng, G.C., Ramachandran, N.P., Ho, L.C., Yap, E.H., Singh, M. (1993). In vitro encystment and experimental infections of Blastocystis hominis. Parasitology Research 79 (6) : 456-460. ScholarBank@NUS Repository.
Abstract: Cultures of Blastocystis hominis were induced to encyst using three encystation media: (a) an encystation medium (EM) comprising yeast extract in buffered saline containing 50% horse serum, (b) an encystation medium (CEM) comprising EM conditioned with bacterial soluble products and (c) an encystation medium (TEM) containing 0.5% trypticase in EM. Two isolates of B. hominis were studied, an axenized isolate C and a non-axenized isolate MS. In EM, isolate C did not encyst, whereas 6.1% of isolate MS had encysted by day 1. However, in CEM and TEM, 17.4% and 25.7% of isolate C, respectively, had encysted by day 5. In all three media, isolate MS encysted more readily than isolate C, with as much as 91.7% of the former encysting in TEM. As viewed by phase-contrast microscopy, cyst-like stages appeared highly refractile. Direct stool examination of juvenile Wistar rats infected with 10000 cyst-like stages of both C and MS isolates showed Blastocystis at day 2 post-infection. At autopsy on day 7, large numbers of Blastocystis were seen in the cecum, with smaller numbers being observed in the large intestine. In contrast, rats fed with various inocula of the vacuolar stages of isolates C and MS did not become infected, indicating the importance of the encysted stages in the transmission of the parasite.
Source Title: Parasitology Research
URI: http://scholarbank.nus.edu.sg/handle/10635/130986
ISSN: 00443255
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

Page view(s)

14
checked on Aug 9, 2018

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.