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Sian Floyd

BSc MSc

Associate Professor
in Epidemiology and Medical Statistics

Room
Room 105a

LSHTM
Keppel Street
London
WC1E 7HT
United Kingdom

Tel.
020 7927 2516

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.

Affiliations

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.

Research Area
Clinical trials
Complex interventions
Vaccines
Randomised controlled trials
Discipline
Immunoepidemiology
Epidemiology
Statistics
Disease and Health Conditions
HIV/AIDS
Tuberculosis
Country
Benin
Guinea
Gambia, The
Cambodia
Malawi
Senegal
Uganda
South Africa
Zambia
Region
Sub-Saharan Africa (all income levels)

Selected Publications

Changes Over Time in HIV Prevalence and Sexual Behaviour Among Young Female Sex-Workers in 14 Sites in Zimbabwe, 2013–2016
Chabata ST; Hensen B; Chiyaka T; Mushati P; Mtetwa S; Hanisch D; Napierala S; Busza J; Floyd S; Fearon E
2019
AIDS and Behavior
Awareness and uptake of layered HIV prevention programming for young women: analysis of population-based surveys in three DREAMS settings in Kenya and South Africa
Gourlay A; Birdthistle I; Mthiyane NT; Orindi BO; Muuo S; Kwaro D; Shahmanesh M; Baisley K; Ziraba A; Floyd S
2019
BMC Public Health
Quantifying the contribution of different aged men and women to onwards transmission of HIV-1 in generalised epidemics in sub-Saharan Africa: A modelling and phylogenetics approach from the HPTN071 (PopART) trial
Probert W; Hall M; Xi X; Sauter R; Golubchik T; Bonsall D; Abeler-Dorner L; Pickles M; Cori A; Bwalya J
2019
JOURNAL OF THE INTERNATIONAL AIDS SOCIETY
Work and home productivity of people living with HIV in Zambia and South Africa.
Thomas R; Friebel R; Barker K; Mwenge L; Kanema S; Vanqa N; Harper A; Bell-Mandla N; Smith PC; Floyd S
2019
AIDS
Effect of Universal Testing and Treatment on HIV Incidence - HPTN 071 (PopART).
Hayes RJ; Donnell D; Floyd S; Mandla N; Bwalya J; Sabapathy K; Yang B; Phiri M; Schaap A; Eshleman SH
2019
The New England journal of medicine
Understanding the Time Needed to Link to Care and Start ART in Seven HPTN 071 (PopART) Study Communities in Zambia and South Africa.
Seeley J; Bond V; Yang B; Floyd S; MacLeod D; Viljoen L; Phiri M; Simuyaba M; Hoddinott G; Shanaube K
2018
AIDS and behavior
Community distribution of oral HIV self-test kits nested in four HPTN 071 (PopART) communities in Zambia: A cluster-randomized trial
Mulubwa C; Hensen B; Phiri M; Shanaube K; Schaap A; Floyd S; Phiri C; Chiti B; Bond V; Simwinga M
2018
Lancet HIV
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