Occurrence of <i>Giardia</i> in the effluents of a waste water treatment plant in Dhaka

Abstract

The present study was designed for the qualitative and quantitative detection of Giardia in the Pagla Sewage Treatment Plant (PSTP) in Dhaka. The physico-chemical parameters of the sewage water were also recorded. Total 72 raw and treated samples were collected from PSTP throughout the year 2008 and these were processed with the Formol-Ether Concentration method and IMS followed by microscopy to identify Giardia in the sewage water. The protozoan parasite Giardia was abundant (2.23±1.44 × 105 cyst/l) in the sewage water dominating the sampling sites-Grit chamber (44%), Measuring chamber (34%) and Outlet lagoon (38%). A low abundance of Giardia in the PSTP starting from the first point to the last one indicates the waste water treatment efficiency for removal of the pathogen. A significant correlation was found for log (number of Giardia +1) with turbidity (r= 0.729) and TDS (r= 0.536) at 0.01level.DOI: http://dx.doi.org/10.3329/bjz.v39i2.10578 Bangladesh J. Zool. 39(2): 147-156, 2011

Prevalence of Giardia lamblia in Asymptomatic Patients by Direct Examination and ELISA Methods

“…Asymptomatic persons can shed the G.lamblia cysts in the environment. Thus, the diagnosis of G. lamblia infection in asymptomatic with the epidemiological factors contributing to the transmission play an important role in achieving control and transmission (14). Some reports have been documented, Rosoff (15) reported that out of the 232 randomly collected specimens, 16 were positive by microscope examination and immunoassay, 6 were negative by microscopic examination but positive by immunoassay.…”

“…Agreement observed with the results of a study showed that from 54 specimens collected from 30 patients 18 asymptomatically infected with G. lamblia and 12 with symptoms were determined to be positive (16). Other result was conducted by (14) in which the prevalence of G. lamblia infection among asymptomatic children was 37.93% by microscopy and 76.11% by ELISA.…”

Detection of Giardia lamblia in children by microscopy, ELISA and real time PCR assay

“…Interestingly, most of them are asymptomatic and can shed the Giardia cysts in the environment. Thus, the diagnosis of G. lamblia infection in asymptomatic infection plays an important role in achieving control and transmission (3) . Clinical manifestation ranges from asymptomatic carriage to acute and chronic gastrointestinal infections (4) .…”