scholarly journals High serological response to Cryptosporidium-specific antigens in the Czech Republic and its association with water supply

2019 ◽  
Vol 17 (5) ◽  
pp. 691-700 ◽  
Author(s):  
Petr Pumann ◽  
František Kožíšek ◽  
Gunther F. Craun ◽  
Twila R. Kunde ◽  
Marek Malý ◽  
...  
Keyword(s):  
Drinking Water ◽  
Czech Republic ◽  
Surface Water ◽  
Blood Donors ◽  
Water Sources ◽  
Serological Response ◽  
Strong Response ◽  
River Bank ◽  
The Czech Republic ◽  
Specific Antigens

AbstractA survey was conducted in the Czech Republic to determine whether serological responses to the 15/17-kDa and 27-kDa Cryptosporidium antigens had changed since the end of the communist era and if these responses were associated with drinking water sources. Sera from 301 blood donors residing in six areas served by various sources of drinking water were analysed by Western Blot (mini-immunoblots) to measure the IgG response. The intensity of response and percentage of persons with a strong response to the 27-kDa, but not the 15/17-kDa, antigen were higher than found 20 years earlier. A strong response to both the 15/17- and 27-kDa-antigens was higher than reported in other countries, and the probability of persons having a strong response was greater in areas with surface water sources than river-bank infiltration. Few cases of cryptosporidiosis were reported in spite of these high responses to Cryptosporidium antigens. These responses suggest a chronic low-level exposure from several sources that may be affording protection against symptoms and illness. Although strong serological responses were associated with surface water sources, drinking water is not likely to be the most important exposure for Cryptosporidium in the Czech Republic.

scholarly journals Serological responses toCryptosporidium-specific antigens in Czech populations with different water sources

2007 ◽  
Vol 136 (2) ◽  
pp. 279-286 ◽  
Author(s):  
F. KOZISEK ◽  
G. F. CRAUN ◽  
L. CEROVSKA ◽  
P. PUMANN ◽  
F. FROST ◽  
...  
Keyword(s):  
Czech Republic ◽  
Surface Waters ◽  
Protective Immunity ◽  
Serological Response ◽  
Strong Response ◽  
The Czech Republic ◽  
Study Population ◽  
Specific Antigens ◽  
Fractured Sandstone ◽  
Bank Infiltration

SUMMARYSerological responses toCryptosporidium-specific antigens (15/17 and 27 kDa) were compared among populations in four areas of the Czech Republic that use drinking water from clearly defined sources: (1) wells in a fractured sandstone aquifer, (2) riverbank infiltration, or (3) two different filtered and chlorinated surface waters. Among persons surveyed in the area with riverbank-infiltration water, 33% had a strong serological response to the 15/17-kDa antigen group whereas, in the other three areas, over 72% of persons had a strong response. These response differences suggest thatCryptosporidiumexposures and infection were lower in the area with bank infiltration. The large percentage of the study population with a strong serological response to both antigens suggests high levels of previous infections that may have resulted in protective immunity for cryptosporidiosis. This may be one reason why no waterborne cryptosporidiosis outbreaks and few cases of cryptosporidiosis have been reported in the Czech Republic.

scholarly journals Serological responses to Cryptosporidium antigens among users of surface- vs. ground-water sources

2003 ◽  
Vol 131 (3) ◽  
pp. 1131-1138 ◽  
Author(s):  
F. J. FROST ◽  
T. R. KUNDE ◽  
T. B. MULLER ◽  
G. F. CRAUN ◽  
L. M. KATZ ◽  
...  
Keyword(s):  
Drinking Water ◽  
Surface Water ◽  
Ground Water ◽  
Multivariate Logistic Regression Analysis ◽  
Water Sources ◽  
Serological Response ◽  
Water Users ◽  
The People ◽  
Increased Risk ◽  
Relative Prevalence

Cryptosporidium oocysts are commonly detected in surface-derived drinking water. However, the public health significance of these findings is unclear. This study compared serological responses to two Cryptosporidium antigen groups for blood donors and college students using chlorinated and filtered river water vs. ground-water sources. The surface water received agricultural and domestic sewage discharges upstream. Participants from the surface-water city had a higher relative prevalence (RP) of a serological response to the 15/17-kDa antigen group (72·3 vs. 52·4%, RP=1·36, P<0·001) and to the 27-kDa antigen group (82·6 vs. 72·5%, RP=1·14, P<0·02). Multivariate logistic regression analysis found that the people with a shorter duration of residence or drinking bottled water also had a lower seropositivity for each marker. Use of private wells was associated with a higher prevalence of response to the 15/17-kDa markers. Seroconversion to the 15/17-kDa antigen group was more common in the residents of the city using surface water. These findings are consistent with an increased risk of Cryptosporidium infection for users of surface-derived drinking water compared with users of municipal ground-water-derived drinking water. Users of private well water may also have an increased risk of infections.

Monitoring of pesticides in drinking water: finding the right balance between under- and over-monitoring – experience from the Czech Republic

2021 ◽  
Author(s):  
Filip Kotal ◽  
František Kožíšek ◽  
Hana Jeligová ◽  
Adam Vavrouš ◽  
Daniel Gari Wayessa ◽  
...  
Keyword(s):  
Drinking Water ◽  
Czech Republic ◽  
Water Supply ◽  
The Czech Republic ◽  
The Right

The modern, risk-based approach requires that only those pollutants which are likely to be present in a given water supply should be monitored in drinking water. From this perspective, defining...

scholarly journals Perceived agricultural runoff impact on drinking water

2014 ◽  
Vol 12 (3) ◽  
pp. 484-491 ◽  
Author(s):  
Andrea Crampton ◽  
Angela T. Ragusa
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Surface Water ◽  
Agricultural Runoff ◽  
Water Sources ◽  
Urban Residents ◽  
Agricultural Activity ◽  
Rural Residents ◽  
Management Measures ◽  
Agricultural Contaminants

Agricultural runoff into surface water is a problem in Australia, as it is in arguably all agriculturally active countries. While farm practices and resource management measures are employed to reduce downstream effects, they are often either technically insufficient or practically unsustainable. Therefore, consumers may still be exposed to agrichemicals whenever they turn on the tap. For rural residents surrounded by agriculture, the link between agriculture and water quality is easy to make and thus informed decisions about water consumption are possible. Urban residents, however, are removed from agricultural activity and indeed drinking water sources. Urban and rural residents were interviewed to identify perceptions of agriculture's impact on drinking water. Rural residents thought agriculture could impact their water quality and, in many cases, actively avoided it, often preferring tank to surface water sources. Urban residents generally did not perceive agriculture to pose health risks to their drinking water. Although there are more agricultural contaminants recognised in the latest Australian Drinking Water Guidelines than previously, we argue this is insufficient to enhance consumer protection. Health authorities may better serve the public by improving their proactivity and providing communities and water utilities with the capacity to effectively monitor and address agricultural runoff.

scholarly journals Change in dissolved oxygen concentrations during aeration and mixing using a combined system

2021 ◽  
Vol 900 (1) ◽  
pp. 012039
Author(s):  
V Singrova ◽  
P Hlustik
Keyword(s):  
Drinking Water ◽  
Czech Republic ◽  
Dissolved Oxygen ◽  
Not Given ◽  
Combined System ◽  
The Czech Republic ◽  
Oxygen Concentrations

Abstract Combined mixing and aeration systems are not given priority in the Czech Republic. Still, they are installed at several WWTPs. Their advantage is mixing and aerating at the same time. This article provides data from actual measurements where a combined system was used for drinking water including necessary chemicals. The text below evaluates the course of changes in the concentration of dissolved oxygen in different points in the reactor depending on time.

scholarly journals Draft Genome Sequence of Aeromonas cavernicola sp. nov. DSM 24474T, Isolated from a Cavern Brook in the Moravia Region of the Czech Republic

2018 ◽  
Vol 6 (15) ◽  
pp. e00227-18
Author(s):  
S. M. Colston ◽  
A. Navarro ◽  
A. J. Martinez-Murcia ◽  
J. Graf
Keyword(s):  
Czech Republic ◽  
Genome Sequence ◽  
Novel Species ◽  
Draft Genome ◽  
Water Sources ◽  
Draft Genome Sequence ◽  
The Czech Republic ◽  
Content Type

ABSTRACT Species of the Aeromonas genus can be found in numerous environmental milieus, including various water sources, and some species cause disease in animals. We present here the draft genome sequence for Aeromonas cavernicola DSM 24474T, a novel species isolated from a freshwater brook within a cavern in the Czech Republic.

scholarly journals Evaluation of the SWAT model as an integrated management tool in the Švihov drinking water supply catchment

2019 ◽  
Vol 14 (No. 2) ◽  
pp. 76-83
Author(s):  
Jan Gregar ◽  
Jan Petrů ◽  
Jana Novotná
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Czech Republic ◽  
Water Supply ◽  
Integrated Management ◽  
Swat Model ◽  
Point Sources ◽  
Drinking Water Supply ◽  
Management Tool ◽  
The Czech Republic

Švihov dam, the largest drinking water source in the Czech Republic and Central Europe, has problems with eutrophication. The Švihov dam catchment spreads over 1200 km<sup>2</sup> and supplies over 1.5 million people in the capital of Prague and the Central Bohemian region with drinking water. Due to intensive agricultural activities and a lack of wastewater treatment plants in small settlements, the water quality is deteriorating. As a result, corrective measures need to be taken. Technological Agency of the Czech Republic supported this research which proposes different scenarios for a reduction of water quality degradation in the dam. The Trnávka dam watershed was chosen for study purposes as it occupies one quarter of the Švihov dam watershed. Hydrological balance was established using measured data. Point and non-point sources of nutrients were determined by field research and included in a Soil and Water Assessment Tool (SWAT) model. This study aims to propose complex watershed management to improve the state of the environment in the entire area and to reduce eutrophication. Different management practices would reduce nutrient loads of streams and increase water quality which is the critical factor in dam eutrophication. This research brings methodology and systematic approach to integrated management, and can be applied not only for the Švihov dam, but also for other watersheds, including those which function as drinking water supply.

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