Thomas Clasen

Thomas Clasen - JD MSc PhD


Reader in Water, Sanitation and Health



+ 1 414 243 2302

London School of Hygiene & Tropical Medicine
Keppel Street
London WC1E 7H

Background


After obtaining a JD from Georgetown University in 1981, I joined Foley & Lardner, a 1000+ lawyer US firm where I was responsible for international business transactions, becoming a partner in 1987. In 1994 I left the firm to become Vice President, General Counsel and a Director of Everett Smith Group, Ltd., a US$1 billion conglomerate.

My interest in waterborne disease arose from investments in point-of-use water treatment technologies (Exstream and First Water). I received my MSc (Control of Infectious Diseases) and PhD (Prevention of Waterborne Disease) from the University of London, and joined the faculty at LSHTM in 2004.


Teaching/Research


Epidemiology and Control of Infectious Diseases (ID301); Water and Sanitation (ID201). Formerly, Adjunct Professor, School of Law, University of Wisconsin, Madison, Wisconsin, USA. Adjunct Professor, Graduate School of Business, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin, USA.

My publications include randomized controlled field trials to assess the health impact of water, sanitation and hygiene interventions, systematic reviews of water quality and sanitation interventions to prevent diarrhoeal disease and enteric infection, assessments of water and sanitation interventions in emergency and outbreak response, and cost and cost-effectiveness analyses of water and sanitation interventions in developing countries.

My current research includes a large-scale cluster-randomized trial to assess the impact of rural sanitation on diarrhoea, anthropometrics and helminth infection; a systematic review and field study to compare the health impact of shared sanitation with individual household latrines; field studies to assess and develop interventions to improve the collection and disposal of child faeces; a blinded, randomized controlled field trial of chlorine tablets in India; and a health impact evaluation of a large-scale deployment of water filters and improved cook-stoves in Rwanda; and providing advice on sanitation and water treatment to a large scale trial in Kenya and Bangladesh.


Research Areas

  • Clinical trials
  • Disease control
  • Environmental health
  • Evaluation
  • Global health
  • Health impact analysis
  • Heatlh outcomes
  • Sanitation
  • Water

Publications

Journal Article - Original Research
Assessing the impact of household water treatment with NaDCC tablet: a randomized, controlled trial in Orissa, India.
Boisson, S; Stevenson, M; Shapiro, L; Kuman, V; Singh, LP; Ward, D; Clasen, T.;
PLOS Med, In Press;
DOI · PubMed · WoS · Abstract · WWW · Full Record · Journal Article - Original Research


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.
Funk, A.L. ; Boisson, S. ; Clasen, T. ; Ensink, J.H. ;
Acta Trop, 2013;
DOI · PubMed · WoS · Abstract · WWW · Full Record · Update from Pubmed · Research Online·Journal Article - Original Research · IF(2009): 2.221


Effective Use of Household Water Treatment and Safe Storage in Response to the 2010 Haiti Earthquake.
Lantagne, D. ; Clasen, T. ;
Am J Trop Med Hyg, 2013;
DOI · PubMed · WoS · Abstract · WWW · Full Record · Update from Pubmed · Research Online·Journal Article - Original Research · IF(2009): 2.795


Preventing cryptosporidiosis: the need for safe drinking water.
Peletz, R. ; Mahin, T. ; Elliott, M. ; Montgomery, M. ; Clasen, T. ;
Bull World Health Organ, 2013; 91(4):238
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 5.302 ·


Water, sanitation, and hygiene interventions to improve health among people living with HIV/AIDS: a systematic review
Peletz, R.L.; Mahin, T.; Elliot, M.; Harris, M.S.; Chan, K.S.; Cohen, M.S.; Bartram, J.K.; Clasen, T.F.
AIDS, 2013; Publish Ahead of Print
DOI · PubMed · WoS · Abstract · · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 4.909 ·


High adherence is necessary to realize health gains from water quality interventions.
Brown, J. ; Clasen, T. ;
PLoS One, 2012; 7(5):e36735
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 4.351 ·


The effect of improved rural sanitation on diarrhoea and helminth infection: design of a cluster-randomized trial in Orissa, India.
Clasen, T. ; Boisson, S. ; Routray, P. ; Cumming, O. ; Jenkins, M. ; Ensink, J.H. ; Bell, M. ; Freeman, M.C. ; Peppin, S. ; Schmidt, W.P. ;
Emerg Themes Epidemiol, 2012; 9(1):7
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): ·


Making Sanitation Count: Developing and Testing a Device for Assessing Latrine Use in Low-Income Settings.
Clasen, T.; Fabini, D.; Boisson, S.; Taneja, J.; Song, J.; Aichinger, E.; Bui, A.; Dadashi, S.; Schmidt, W.P.; Burt, Z.; Nelson, K.L.;
Environ Sci Technol, 2012; 46(6):3295-303
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 4.63


Linking Quantitative Microbial Risk Assessment and Epidemiological Data: Informing Safe Drinking Water Trials in Developing Countries
Enger, K.S.; Nelson, K.L.; Clasen, T.; Rose, J.B.; Eisenberg, J.N.S.
Environmental Science & Technology, 2012; 46(9):5160-5167
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 4.63


Assessing Water Filtration and Safe Storage in Households with Young Children of HIV-Positive Mothers: A Randomized, Controlled Trial in Zambia.
Peletz, R. ; Simunyama, M. ; Sarenje, K. ; Baisley, K. ; Filteau, S. ; Kelly, P. ; Clasen, T. ;
PLoS One, 2012; 7(10):e46548
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 4.351


Journal Article - Original Research

Assessing the Impact of a School-based Safe Water Intervention on Household Adoption of Point-of-Use Water Treatment Practices in Southern India.
Freeman, M.C. ; Clasen, T. ;
Am J Trop Med Hyg, 2011; 84(3):370-8
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 2.795 ·


Cost of community integrated prevention campaign for malaria, HIV, and diarrhea in rural Kenya.
Kahn, J.G. ; Harris, B. ; Mermin, J.H. ; Clasen, T. ; Lugada, E. ; Grabowksy, M. ; Vestergaard Frandsen, M. ; Garg, N. ;
BMC Health Serv Res, 2011; 11:346
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 1.66


Drinking Water Quality, Feeding Practices, and Diarrhea among Children under 2 Years of HIV-Positive Mothers in Peri-Urban Zambia.
Peletz, R. ; Simuyandi, M. ; Sarenje, K. ; Baisley, K. ; Kelly, P. ; Filteau, S. ; Clasen, T. ;
Am J Trop Med Hyg, 2011; 85(2):318-26
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 2.795


Assessing the Microbiological Performance and Potential Cost of Boiling Drinking Water in Urban Zambia.
Psutka, R. ; Peletz, R. ; Michelo, S. ; Kelly, P. ; Clasen, T. ;
Environ Sci Technol, 2011;
DOI · PubMed · WoS · Abstract · WWW · Full Record · Update from Pubmed · Research Online·Journal Article - Original Research · IF(2009): 4.63


Epidemiological methods in diarrhoea studies--an update.
Schmidt, W.P. ; Arnold, B.F. ; Boisson, S. ; Genser, B. ; Luby, S.P. ; Barreto, M.L. ; Clasen, T. ; Cairncross, S. ;
Int J Epidemiol, 2011; 40(6):1678-92
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 5.262


Field Assessment of a Novel Household-Based Water Filtration Device: A Randomised, Placebo-Controlled Trial in the Democratic Republic of Congo
Boisson, S.; Kiyombo, M.; Sthreshley, L.; Tumba, S.; Makambo, J.; Clasen, T.;
Plos One, 2010; 5(9):e12613
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 4.351


Household Water Treatment and the Millennium Development Goals: Keeping the Focus on Health.
Clasen, T.F.;
Environ Sci Technol, 2010; 44(19):7357-60
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 4.63


Interventions to improve disposal of human excreta for preventing diarrhoea.
Clasen, T.F.; Bostoen, K.; Schmidt, W.P.; Boisson, S.; Fung, I.C.; Jenkins, M.W.; Scott, B.; Sugden, S.; Cairncross, S.;
Cochrane Database Syst Rev, 2010; 6:CD007180
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 5.653


Quantifying Health Improvements from Water Quantity Enhancement: An Engineering Perspective Applied to Rainwater Harvesting in West Africa.
Fry, L.M.; Cowden, J.R.; Watkins, D.W.; Clasen, T.; Mihelcic, J.R.;
Environ Sci Technol, 2010;
DOI · PubMed · WoS · Abstract · WWW · Full Record · Update from Pubmed · Research Online·Journal Article - Original Research · IF(2009): 4.63


Estimating the scope of household water treatment in low- and medium-income countries.
Rosa, G.; Clasen, T.;
Am J Trop Med Hyg, 2010; 82(2):289-300
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 2.795


Journal Article - Original Research
Microbiological effectiveness of disinfecting water by boiling in rural guatemala.
Rosa, G.; Miller, L.; Clasen, T.;
Am J Trop Med Hyg, 2010; 82(3):473-7
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 2.795


Sampling strategies to measure the prevalence of common recurrent infections in longitudinal studies.
Schmidt, W.P.; Genser, B.; Barreto, M.L.; Clasen, T.; Luby, S.P.; Cairncross, S.; Chalabi, Z.;
Emerg Themes Epidemiol, 2010; 7(1):5
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): ·


Randomized controlled trial in rural Ethiopia to assess a portable water treatment device.
Boisson, S.; Schmidt, W.P.; Berhanu, T.; Gezahegn, H.; Clasen, T.;
Environ Sci Technol, 2009; 43(15):5934-9
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 4.63


Laboratory assessment of a gravity-fed ultrafiltration water treatment device designed for household use in low-income settings.
Clasen, T.; Naranjo, J.; Frauchiger, D.; Gerba, C.;
Am J Trop Med Hyg, 2009; 80(5):819-23
DOI · PubMed · WoS · Abstract · WWW · Full Record · Update from Pubmed · Research Online·Journal Article - Original Research · IF(2009): 2.795


Recent diarrhoeal illness and risk of lower respiratory infections in children under the age of 5 years.
Schmidt, W.P.; Cairncross, S.; Barreto, M.L.; Clasen, T.; Genser, B.;
Int J Epidemiol, 2009; 38(3):766-72
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 5.262


Interventions to improve excreta disposal for the prevention of diarrhoea. (Protocol for a Cochrane Review)
Clasen, T.; Bostoen, K.; Schmidt, W.; Boisson, S.; Fung, I.; Jenkins, M.; Scott, B.; Sugden, S.; Cairncross, S.
The Cochrane Library, 2008; (2)
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · ·


Microbiological effectiveness and cost of disinfecting water by boiling in semi-urban India.
Clasen, T.; McLaughlin, C.; Nayaar, N.; Boisson, S.; Gupta, R.; Desai, D.; Shah, N.;
Am J Trop Med Hyg, 2008; 79(3):407-13
DOI · PubMed · WoS · Abstract · WWW · Full Record · Update from Pubmed · Research Online·Journal Article - Original Research · IF(2009): 2.795


Microbiological effectiveness and cost of boiling to disinfect drinking water in rural Vietnam.
Clasen, T.F.; Thao, d.o. .H.; Boisson, S.; Shipin, O.;
Environ Sci Technol, 2008; 42(12):4255-60
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 4.63


Cost-effectiveness of water quality interventions for preventing diarrhoeal disease in developing countries.
Clasen, T.; Cairncross, S.; Haller, L.; Bartram, J.; Walker, D.;
J Water Health, 2007; 5(4):599-608
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 1.469


Microbiological performance of common water treatment devices for household use in India.
Clasen, T.; Menon, S.;
Int J Environ Health Res, 2007; 17(2):83-93
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 1.066


HOUSEHOLD WATER TREATMENT USING SODIUM DICHLOROISOCY ANURATE (NaDCC) TABLETS: A RANDOMIZED, CONTROLLED TRIAL TO ASSESS MICROBIOLOGICAL EFFECTIVENESS IN BANGLADESH.
Clasen, T.; Saeed, T.F.; Boisson, S.; Edmondson, P.; Shipin, O.;
Am J Trop Med Hyg, 2007; 76(1):187-192
DOI · PubMed · WoS · Abstract · WWW · Full Record · Update from Pubmed · Research Online·Journal Article - Original Research · IF(2009): 2.795


Interventions to improve water quality for preventing diarrhoea: systematic review and meta-analysis.
Clasen, T.; Schmidt, W.P.; Rabie, T.; Roberts, I.; Cairncross, S.;
BMJ, 2007; 334(7597):782
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 13.66


Household-based ceramic water filters for the treatment of drinking water in disaster response: an assessment of a pilot programme in the Dominican Republic
Clasen, T.; Boisson, S.
Water Practice & Tech, 2006; 1(2)
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · ·


Microbiological performance of a water treatment unit designed for household use in developing countries.
Clasen, T.; Nadakatti, S.; Menon, S.;
Trop Med Int Health, 2006; 11(9):1399-405
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 2.328


Interventions to improve water quality for preventing diarrhoea
Clasen, T.; Roberts, I.; Rabie, T.; Schmidt, W.; Cairncross, S.
Cochrane Database of Systematic Reviews, 2006; 3(3):CD004794
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 5.653


The drinking water response to the Indian Ocean tsunami, including the role of household water treatment
Clasen, T.; Smith, L.; Albert, J.; Bastable, A.; Fesselet, J.
Disaster Prevention & Management, 2006; 15(1):190-201
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · ·


Preventing diarrhoea with household ceramic water filters: Assessment of a pilot project in Bolivia.
Clasen, T.F.; Brown, J.; Collin, S.M.;
Int J Environ Health Res, 2006; 16(3):231-9
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 1.066


Estimating the Longitudinal Prevalence of Diarrhea and Other Episodic Diseases: Continuous Versus Intermittent Surveillance.
Schmidt, W.P.; Luby, S.P.; Genser, B.; Barreto, M.L.; Clasen, T.;
Epidemiology, 2006; 18(5):537-543
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 5.511


Sodium dichloroisocyanurate (NaDCC) tablets as an alternative to sodium hypochlorite for the routine treatment of drinking water at the household level.
Clasen, T.; Edmondson, P.;
Int J Hyg Environ Health, 2005; 209(2):173-81
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 2.64


Household-based ceramic water filters for the prevention of diarrhea: a randomized, controlled trial of a pilot program in Colombia.
Clasen, T.; Parra, G.G.; Boisson, S.; Collin, S.;
Am J Trop Med Hyg, 2005; 73(4):790-5
DOI · PubMed · WoS · Abstract · WWW · Full Record · Update from Pubmed · Research Online·Journal Article - Original Research · IF(2009): 2.795


Safe household water treatment and storage using ceramic drip filters: a randomised controlled trial in Bolivia.
Clasen, T.; Brown, J.; Suntura, O.; Collin, S.;
Water Sci Technol , 2004; 50(1):111-5
DOI · PubMed · WoS · Abstract · WWW · Full Record · Update from Pubmed · Research Online·Journal Article - Original Research · IF(2009): 1.094


REDUCING DIARRHEA THROUGH THE USE OF HOUSEHOLD-BASED CERAMIC WATER FILTERS: A RANDOMIZED, CONTROLLED TRIAL IN RURAL BOLIVIA.
Clasen, T.F.; Brown, J.; Collin, S.; Suntura, O.; Cairncross, S.;
Am J Trop Med Hyg , 2004; 70(6):651-7
DOI · PubMed · WoS · Abstract · WWW · Full Record · Update from Pubmed · Research Online·Journal Article - Original Research · IF(2009): 2.795


International network to promote household water treatment and safe storage.
Clasen, T.F.; Mintz, E.D.;
Emerg Infect Dis , 2004; 10(6):1179-80
DOI · PubMed · WoS · Abstract · WWW · Full Record · Update from Pubmed · Research Online·Journal Article - Original Research · IF(2009): 6.794


Faecal contamination of drinking water during collection and household storage: the need to extend protection to the point of use
Clasen, T. F.; Bastable, A.
Journal of Water and Health, 2003; 1(3):109-115
DOI · PubMed · WoS · Abstract · WWW · Full Record · Research Online·Journal Article - Original Research · IF(2009): 1.469


Faecal contamination of drinking water during collection and household storage: the need to extend protection to the point of use.
Clasen, T.F.; Bastable, A.;
J Water Health, 2003; 1(3):109-15
DOI · PubMed · WoS · Abstract · WWW · Full Record · Update from Pubmed · Research Online·Journal Article - Original Research · IF(2009): 1.469


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