Sian Floyd BSc MSc

Senior Lecturer in Epidemiology and Medical Statistics

• Affiliation
• Teaching
• Research
• Publications

• Room 105a
• LSHTM
• Keppel Street
• London
• WC1E 7HT
• T: 020 7612 7888
• F: 020 7636 8739

Sian Floyd joined the school in 1998. She obtained an MSc in Biometry from Reading University in 1993, and then worked as a biometrician in the agricultural and natural resources sector for four years, first in the Caribbean and then in the UK.

Affiliation

• Department of Infectious Disease Epidemiology

Teaching

Sian is a co-organiser, with James Lewis, for the distance-learning Advanced Statistical Methods in Epidemiology module (since 2004). Prior to this she was co-organiser for the in-house Statistical Methods in Epidemiology study unit, from 2000-2003. She currently teaches on the study units Statistical Methods in Epidemiology, and Epidemiology and Control of Communicable Diseases.

Research

Sian works as a statistician/epidemiologist on the Karonga Prevention Study (KPS), which is based in northern Malawi. Her research on this project focuses on quantifying and understanding the extent to which the provision of free anti-retroviral therapy (ART) reverses the impact of the HIV epidemic. Important outcomes that are being measured include: child and adult mortality; social and economic consequences such as orphanhood, educational achievement of children, and household poverty; HIV incidence and sexual behaviour at the population level; and the percentage of the adult population who know their HIV status. She also contributes to the work of the Alpha-Network (Analysis of Longitudinal data on HIV/AIDS on Africa), which is led by Professor Basia Zaba. This network brings together researchers from demographic surveillance sites (DSS) in sub-Saharan Africa (including in Malawi, South Africa, Tanzania, Uganda, and Zimbabwe), and combines research with capacity-building through themed workshops.

Sian has also worked on case-control and cohort studies of tuberculosis, including immuno-epidemiological studies,  and is currently a member of an expert group convened by WHO whose mandate is to support 21 global focus countries to design, implement, and analyse TB prevalence surveys between 2008 and 2015.

• Selected publications

• Recurrent TB: relapse or reinfection? The effect of HIV in a general population cohort in Malawi.

  Crampin, A.C.; Mwaungulu, J.N.; Mwaungulu, F.D.; Mwafulirwa, D.T.; Munthali, K.; Floyd, S.; Fine, P.E.; Glynn, J.R.;

  AIDS, 2010; 24(3):417-26

• Declining child mortality in northern Malawi despite high rates of infection with HIV.

  Jahn, A.; Floyd, S.; Crampin, A.C.; Mvula, H.; Mwinuka, V.; Mwaiyeghele, E.; McGrath, N.; Zaba, B.; Fine, P.E.; Glynn, J.R.;

  Bull World Health Organ, 2010; 88(10):746-53

• Population-level reduction in adult mortality after extension of free anti-retroviral therapy provision into rural areas in northern Malawi.

  Floyd, S.; Molesworth, A.; Dube, A.; Banda, E.; Jahn, A.; Mwafulirwa, C.; Ngwira, B.; Branson, K.; Crampin, A.C.; Zaba, B.; Glynn, J.R.; French, N.;

  PLoS One, 2010; 5(10):e13499

• Is education the link between orphanhood and HIV/HSV-2 risk among female adolescents in urban Zimbabwe?

  Birdthistle, I.; Floyd, S.; Nyagadza, A.; Mudziwapasi, N.; Gregson, S.; Glynn, J.R.;

  Soc Sci Med, 2009; 68(10):1810-8

• Complex cytokine profiles induced by BCG vaccination in UK infants.

  Lalor, M.K.; Smith, S.G.; Floyd, S.; Gorak-Stolinska, P.; Weir, R.E.; Blitz, R.; Branson, K.; Fine, P.E.; Dockrell, H.M.;

  Vaccine, 2009; 28(6):1635-41

• The long-term social and economic impact of HIV on the spouses of infected individuals in northern Malawi.

  Floyd, S.; Crampin, A.C.; Glynn, J.R.; Mwenebabu, M.; Mnkhondia, S.; Ngwira, B.; Zaba, B.; Fine, P.E.;

  Trop Med Int Health, 2008; 13(4):520-31

• Assessment and evaluation of contact as a risk factor for tuberculosis in rural Africa.

  Crampin, A.C.; Floyd, S.; Ngwira, B.M.; Mwinuka, V.; Mwaungulu, J.N.; Branson, K.; Fine, P.E.; Glynn, J.R.;

  Int J Tuberc Lung Dis, 2008; 12(6):612-8

• The social and economic impact of parental HIV on children in northern Malawi: Retrospective population-based cohort study.

  Floyd, S.; Crampin, A.C.; Glynn, J.R.; Madise, N.; Mwenebabu, M.; Mnkhondia, S.; Ngwira, B.; Zaba, B.; Fine, P.E.;

  AIDS Care, 2007; 19(6):781-90

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