Thomas Clasen

Summary

Affiliation: London School of Hygiene and Tropical Medicine
Country: UK

Publications

  1. ncbi request reprint Household water management: refining the dominant paradigm
    Thomas F Clasen
    Trop Med Int Health 9:187-91. 2004
  2. ncbi request reprint Microbiological effectiveness and cost of boiling to disinfect drinking water in rural Vietnam
    Thomas F Clasen
    London School of Hygiene and Tropical Medicine, Keppel St, London, WCIE 7H, U K
    Environ Sci Technol 42:4255-60. 2008
  3. pmc The effect of improved rural sanitation on diarrhoea and helminth infection: design of a cluster-randomized trial in Orissa, India
    Thomas Clasen
    Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, UK
    Emerg Themes Epidemiol 9:7. 2012
  4. pmc Cost of community integrated prevention campaign for malaria, HIV, and diarrhea in rural Kenya
    James G Kahn
    Super Models for Global Health, Oakland, California, USA
    BMC Health Serv Res 11:346. 2011
  5. ncbi request reprint Laboratory assessment of a gravity-fed ultrafiltration water treatment device designed for household use in low-income settings
    Thomas Clasen
    Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, England
    Am J Trop Med Hyg 80:819-23. 2009
  6. ncbi request reprint Household water treatment and the millennium development goals: keeping the focus on health
    Thomas F Clasen
    London School of Hygiene and Tropical Medicine
    Environ Sci Technol 44:7357-60. 2010
  7. ncbi request reprint Microbiological effectiveness and cost of disinfecting water by boiling in semi-urban India
    Thomas Clasen
    Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, UK
    Am J Trop Med Hyg 79:407-13. 2008
  8. ncbi request reprint Cost-effectiveness of water quality interventions for preventing diarrhoeal disease in developing countries
    Thomas Clasen
    London School of Hygiene and Tropical Medicine, Keppel St, London, WC1E 7HT, UK
    J Water Health 5:599-608. 2007
  9. ncbi request reprint Microbiological performance of common water treatment devices for household use in India
    Thomas Clasen
    Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, Disease Control and Vector Biology Unit, London, UK
    Int J Environ Health Res 17:83-93. 2007
  10. pmc Interventions to improve water quality for preventing diarrhoea: systematic review and meta-analysis
    Thomas Clasen
    Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London WC1E 7HT
    BMJ 334:782. 2007

Collaborators

Detail Information

Publications47

  1. ncbi request reprint Household water management: refining the dominant paradigm
    Thomas F Clasen
    Trop Med Int Health 9:187-91. 2004
  2. ncbi request reprint Microbiological effectiveness and cost of boiling to disinfect drinking water in rural Vietnam
    Thomas F Clasen
    London School of Hygiene and Tropical Medicine, Keppel St, London, WCIE 7H, U K
    Environ Sci Technol 42:4255-60. 2008
    ..272 per month for wood collectors and US$ 1.68 per month for wood purchasers, representing approximately 0.48% to 1.04%, respectively, of the average monthly income of participating households...
  3. pmc The effect of improved rural sanitation on diarrhoea and helminth infection: design of a cluster-randomized trial in Orissa, India
    Thomas Clasen
    Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, UK
    Emerg Themes Epidemiol 9:7. 2012
    ..abstract:..
  4. pmc Cost of community integrated prevention campaign for malaria, HIV, and diarrhea in rural Kenya
    James G Kahn
    Super Models for Global Health, Oakland, California, USA
    BMC Health Serv Res 11:346. 2011
    ..Delivery of community-based prevention services for HIV, malaria, and diarrhea is a major priority and challenge in rural Africa. Integrated delivery campaigns may offer a mechanism to achieve high coverage and efficiency...
  5. ncbi request reprint Laboratory assessment of a gravity-fed ultrafiltration water treatment device designed for household use in low-income settings
    Thomas Clasen
    Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, England
    Am J Trop Med Hyg 80:819-23. 2009
    ..If these results are validated in field trials, the deployment of the unit on a wide scale among vulnerable populations may make an important contribution to public health efforts to control intractable waterborne diseases...
  6. ncbi request reprint Household water treatment and the millennium development goals: keeping the focus on health
    Thomas F Clasen
    London School of Hygiene and Tropical Medicine
    Environ Sci Technol 44:7357-60. 2010
    ....
  7. ncbi request reprint Microbiological effectiveness and cost of disinfecting water by boiling in semi-urban India
    Thomas Clasen
    Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, UK
    Am J Trop Med Hyg 79:407-13. 2008
    ..1% exceeding 100 FC/100 mL. The estimated monthly fuel cost for boiling was INR 43.8 (US$0.88) for households using liquid petroleum gas and INR 34.7 (US$0.69) for households using wood...
  8. ncbi request reprint Cost-effectiveness of water quality interventions for preventing diarrhoeal disease in developing countries
    Thomas Clasen
    London School of Hygiene and Tropical Medicine, Keppel St, London, WC1E 7HT, UK
    J Water Health 5:599-608. 2007
    ..In addition to cost-effectiveness, choices among water quality interventions must be guided by local conditions, user preferences, potential for cost recovery from beneficiaries and other factors...
  9. ncbi request reprint Microbiological performance of common water treatment devices for household use in India
    Thomas Clasen
    Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, Disease Control and Vector Biology Unit, London, UK
    Int J Environ Health Res 17:83-93. 2007
    ..While household water treatment could play an important role in India, standards are necessary so that consumers can ensure that the devices they purchase and use in the home are effective and safe...
  10. pmc Interventions to improve water quality for preventing diarrhoea: systematic review and meta-analysis
    Thomas Clasen
    Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London WC1E 7HT
    BMJ 334:782. 2007
    ..To assess the effectiveness of interventions to improve the microbial quality of drinking water for preventing diarrhoea...
  11. ncbi request reprint Microbiological performance of a water treatment unit designed for household use in developing countries
    Thomas Clasen
    Disease Control and Vector Biology Unit, London School of Hygiene and Tropical Medicine, London, UK
    Trop Med Int Health 11:1399-405. 2006
    ..If these results are validated in field trials, the deployment of the unit on a wide scale among vulnerable populations may make an important contribution to public health efforts to control intractable waterborne diseases...
  12. ncbi request reprint Reducing diarrhea through the use of household-based ceramic water filters: a randomized, controlled trial in rural Bolivia
    Thomas F Clasen
    Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom
    Am J Trop Med Hyg 70:651-7. 2004
    ..001). These results show that affordable ceramic water filters enable low-income households to treat and maintain the microbiologic quality of their drinking water...
  13. ncbi request reprint Interventions to improve water quality for preventing diarrhoea
    T Clasen
    London School of Hygiene and Tropical Medicine, Department of Infectious and Tropical Diseases, Keppel Street, London, UK WC1E 7HT
    Cochrane Database Syst Rev 3:CD004794. 2006
    ....
  14. ncbi request reprint Preventing diarrhoea with household ceramic water filters: assessment of a pilot project in Bolivia
    Thomas F Clasen
    Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, UK
    Int J Environ Health Res 16:231-9. 2006
    ..Water samples from all regularly used filters were free of thermotolerant coliforms...
  15. ncbi request reprint Sodium dichloroisocyanurate (NaDCC) tablets as an alternative to sodium hypochlorite for the routine treatment of drinking water at the household level
    Thomas Clasen
    Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, Keppel St, London WC1E 7HT, UK
    Int J Hyg Environ Health 209:173-81. 2006
    ..Finally, we examine studies and data to compare NaDCC with NaOCl in terms of compliance, acceptability, affordability and sustainability, and suggest areas for further research...
  16. ncbi request reprint Household-based ceramic water filters for the prevention of diarrhea: a randomized, controlled trial of a pilot program in Colombia
    Thomas Clasen
    Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom
    Am J Trop Med Hyg 73:790-5. 2005
    ....
  17. ncbi request reprint Faecal contamination of drinking water during collection and household storage: the need to extend protection to the point of use
    Thomas F Clasen
    London School of Hygiene and Tropical Medicine, Keppel St, London WC1E 7HT, UK
    J Water Health 1:109-15. 2003
    ..The options for such extended protection, including improved collection and storage methods and household-based water treatment, are discussed...
  18. ncbi request reprint Household water treatment using sodium dichloroisocyanurate (NaDCC) tablets: a randomized, controlled trial to assess microbiological effectiveness in Bangladesh
    Thomas Clasen
    Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom
    Am J Trop Med Hyg 76:187-92. 2007
    ..7% of samples exceeded the WHO guideline value of 5.0 mg/L, underscoring the need to ensure that tablet dose and vessel size are compatible...
  19. ncbi request reprint Safe household water treatment and storage using ceramic drip filters: a randomised controlled trial in Bolivia
    T Clasen
    London School of Hygiene and Tropical Medicine and First Water Ltd, Keppel St, London WC1E 7HT, UK
    Water Sci Technol 50:111-5. 2004
    ..The filter systems also demonstrated an ability to maintain the high quality of the treated water against subsequent re-contamination in the home...
  20. pmc Follow-up study to assess the use and performance of household filters in Zambia
    Rachel Peletz
    London School of Hygiene and Tropical Medicine, London, United Kingdom Tropical Gastroenterology and Nutrition Group, University Teaching Hospital, Lusaka, Zambia Barts and The London School of Medicine, Queen Mary, University of London, London, United Kingdom
    Am J Trop Med Hyg 89:1190-4. 2013
    ....
  21. ncbi request reprint Randomized controlled trial in rural Ethiopia to assess a portable water treatment device
    Sophie Boisson
    Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, Keppel Street, London WCIE 7HT, United Kingdom
    Environ Sci Technol 43:5934-9. 2009
    ....
  22. pmc Assessing water filtration and safe storage in households with young children of HIV-positive mothers: a randomized, controlled trial in Zambia
    Rachel Peletz
    London School of Hygiene and Tropical Medicine, London, United Kingdom
    PLoS ONE 7:e46548. 2012
    ..This population may particularly benefit from an intervention to improve water quality in the home...
  23. pmc Epidemiological methods in diarrhoea studies--an update
    Wolf Peter Schmidt
    Department for Disease Control, Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, UK
    Int J Epidemiol 40:1678-92. 2011
    ..Challenges include the diagnosis based on self-reported symptoms, the logistical burden of intensive surveillance and the variability of diarrhoea in space, time and person...
  24. pmc Recent diarrhoeal illness and risk of lower respiratory infections in children under the age of 5 years
    Wolf Peter Schmidt
    Department for Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, UK
    Int J Epidemiol 38:766-72. 2009
    ..We explored whether this is due to common risk factors for both conditions or whether diarrhoea can increase the risk of ALRI directly...
  25. pmc Impact of Indian Total Sanitation Campaign on latrine coverage and use: a cross-sectional study in Orissa three years following programme implementation
    Sharmani Barnard
    Department of Disease Control, Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom
    PLoS ONE 8:e71438. 2013
    ..In settings like rural India where open defecation is common, this may result in sub-optimal compliance (use), thereby continuing to leave the population exposed to human excreta...
  26. pmc Field assessment of a novel household-based water filtration device: a randomised, placebo-controlled trial in the Democratic Republic of Congo
    Sophie Boisson
    Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom
    PLoS ONE 5:e12613. 2010
    ..However, current methods of treating water at home have certain shortcomings, and there is evidence of bias in the reported health impact of the intervention in open trial designs...
  27. ncbi request reprint Effectiveness of a rural sanitation programme on diarrhoea, soil-transmitted helminth infection, and child malnutrition in Odisha, India: a cluster-randomised trial
    Thomas Clasen
    Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, GA, USA Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, UK Electronic address
    Lancet Glob Health 2:e645-53. 2014
    ..We aimed to assess the effectiveness of a rural sanitation intervention, within the context of the Government of India's Total Sanitation Campaign, to prevent diarrhoea, soil-transmitted helminth infection, and child malnutrition...
  28. pmc Effect of household-based drinking water chlorination on diarrhoea among children under five in Orissa, India: a double-blind randomised placebo-controlled trial
    Sophie Boisson
    Department of Disease Control, Faculty of Tropical and Infectious Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom
    PLoS Med 10:e1001497. 2013
    ..The aim of this study was to measure the effect of in-home water disinfection on diarrhoea among children under five...
  29. pmc Assessing the impact of a school-based safe water intervention on household adoption of point-of-use water treatment practices in southern India
    Matthew C Freeman
    Department of Disease Control, Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, UK
    Am J Trop Med Hyg 84:370-8. 2011
    ..53)...
  30. pmc Drinking water quality, feeding practices, and diarrhea among children under 2 years of HIV-positive mothers in peri-urban Zambia
    Rachel Peletz
    London School of Hygiene and Tropical Medicine, London, UK
    Am J Trop Med Hyg 85:318-26. 2011
    ..60, 95% CI = 1.29-16.42). Children born to HIV-positive mothers were exposed to contaminated water through direct intake of drinking water, indicating the need for interventions to ensure microbiological water quality...
  31. pmc Microbiological effectiveness of disinfecting water by boiling in rural Guatemala
    Ghislaine Rosa
    Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, UK
    Am J Trop Med Hyg 82:473-7. 2010
    ..As actually practiced in the study community, boiling significantly improved the microbiological quality of drinking water, though boiled and stored drinking water is not always free of fecal contaminations...
  32. pmc Child feces disposal practices in rural Orissa: a cross sectional study
    Fiona Majorin
    Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom
    PLoS ONE 9:e89551. 2014
    ....
  33. pmc Sampling strategies to measure the prevalence of common recurrent infections in longitudinal studies
    Wolf Peter Schmidt
    Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, UK
    Emerg Themes Epidemiol 7:5. 2010
    ..In contrast to incidence which usually requires continuous sampling, LP can be measured at intervals. This study explored how many more participants are needed for infrequent sampling to achieve the same study power as frequent sampling...
  34. pmc Estimating the scope of household water treatment in low- and medium-income countries
    Ghislaine Rosa
    Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, Keppel Street, London, United Kingdom
    Am J Trop Med Hyg 82:289-300. 2010
    ..Validation of the household surveys and further analysis of these data could help optimize HWT practices...
  35. ncbi request reprint Making sanitation count: developing and testing a device for assessing latrine use in low-income settings
    Thomas Clasen
    Department of Disease Control, London School of Hygiene and Tropical Medicine, London WC1E 7HT, United Kingdom
    Environ Sci Technol 46:3295-303. 2012
    ....
  36. ncbi request reprint Assessing the microbiological performance and potential cost of boiling drinking water in urban Zambia
    Rebecca Psutka
    London School of Hygiene and Tropical Medicine, Keppel St, London WC1E 7H, United Kingdom
    Environ Sci Technol 45:6095-101. 2011
    ....
  37. pmc High adherence is necessary to realize health gains from water quality interventions
    Joe Brown
    Department of Disease Control, Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom
    PLoS ONE 7:e36735. 2012
    ..Household water treatment (HWT) has been recommended for improving access to potable water where existing sources are unsafe. Reports of low adherence to HWT may limit the usefulness of this approach, however...
  38. ncbi request reprint The geographic and demographic scope of shared sanitation: an analysis of national survey data from low- and middle-income countries
    Marieke Heijnen
    Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, UK
    Trop Med Int Health 19:1334-45. 2014
    ....
  39. ncbi request reprint Promoting latrine construction and use in rural villages practicing open defecation: process evaluation in connection with a randomised controlled trial in Orissa, India
    Sophie Boisson
    Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom
    BMC Res Notes 7:486. 2014
    ..This paper reports on a process evaluation conducted in the context of the trial...
  40. pmc Shared sanitation versus individual household latrines: a systematic review of health outcomes
    Marieke Heijnen
    Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom
    PLoS ONE 9:e93300. 2014
    ..In connection with a proposed change in such policy, we undertook this review to identify and summarize existing evidence that compares health outcomes associated with shared sanitation versus individual household latrines...
  41. pmc Assessing the impact of water filters and improved cook stoves on drinking water quality and household air pollution: a randomised controlled trial in Rwanda
    Ghislaine Rosa
    Department of Disease Control, London School of Hygiene and Tropical Medicine, London, United Kingdom
    PLoS ONE 9:e91011. 2014
    ..5 vs. 20.2 TTC/100 mL, p<0.001) and a median reduction of 48% of 24-h PM2.5 concentrations in the cooking area (p = 0.005). Further studies to increase compliance should be undertaken to better inform large-scale interventions...
  42. ncbi request reprint Comparison of Kato-Katz, ethyl-acetate sedimentation, and Midi Parasep® in the diagnosis of hookworm, Ascaris and Trichuris infections in the context of an evaluation of rural sanitation in India
    Anna L Funk
    Environmental Health Group, London School of Hygiene and Tropical Medicine, Keppel Street, WC1E 7HT, London, UK
    Acta Trop 126:265-8. 2013
    ..The conventional ethyl-acetate technique produced smaller pellets and showed lower pellet mobility as compared to the Midi Parasep(®)...
  43. pmc International network to promote household water treatment and safe storage
    Thomas F Clasen
    London School of Hygiene and Tropical Medicine, United Kingdom
    Emerg Infect Dis 10:1179-80. 2004
  44. ncbi request reprint Estimating the impact of unsafe water, sanitation and hygiene on the global burden of disease: evolving and alternative methods
    Thomas Clasen
    Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, GA, USA Department of Disease Control, Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, UK
    Trop Med Int Health 19:884-93. 2014
    ..We conclude by emphasising the important role of GBD studies and the need to ensure that policy on interventions such as water and sanitation be grounded on methods that are transparent, peer-reviewed and widely accepted. ..
  45. ncbi request reprint Estimating the longitudinal prevalence of diarrhea and other episodic diseases: continuous versus intermittent surveillance
    Wolf Peter Schmidt
    Infectious and Tropical Diseases Department, London School of Hygiene and Tropical Medicine, London, United Kingdom
    Epidemiology 18:537-43. 2007
    ..The aim of this analysis was to compare estimates of longitudinal prevalence based on intermittent sampling at regular intervals with 24- or 48-hour recall, with estimates based on continuous surveillance...
  46. ncbi request reprint Assessing the consistency and microbiological effectiveness of household water treatment practices by urban and rural populations claiming to treat their water at home: a case study in peru
    Ghislaine Rosa
    Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom
    PLoS ONE 9:e114997. 2014
    ..The objective of this study was to examine how HWT practices are actually performed by households identified as HWT users, according to international monitoring standards...
  47. pmc Shared sanitation and the prevalence of diarrhea in young children: evidence from 51 countries, 2001-2011
    James A Fuller
    Department of Epidemiology, University of Michigan School of Public Health, Ann Arbor, Michigan Department of Disease Control, London School of Hygiene and Tropical Medicine, London, United Kingdom
    Am J Trop Med Hyg 91:173-80. 2014
    ..Shared sanitation appears to be a risk factor for diarrhea although differences in socioeconomic status are important. The heterogeneity across countries, however, suggests that the social and economic context is an important factor. ..