Imperial College London


Faculty of MedicineSchool of Public Health

Professor of Global Health



+44 (0)20 7594 1150timothy.hallett




Norfolk PlaceSt Mary's Campus






BibTex format

author = {Olney, JJ and Eaton, J and Braitstein, P and Hogan, J and Hallett, T},
doi = {10.1002/jia2.25142},
journal = {Journal of the International AIDS Society},
title = {Optimal timing of HIV home-based counselling and testing rounds in Western Kenya},
url = {},
volume = {21},
year = {2018}

RIS format (EndNote, RefMan)

AB - Introduction:Weaknesses in care programmes providing antiretroviral therapy (ART) persist and are often instigated by late HIV diagnosis and poor linkage to care. We investigated the potential for a homebased counselling and testing (HBCT) campaign to be improved through the optimal timing and enhancement of testing rounds to generate greater health outcomes at minimum cost.Methods:Using a mathematical model of HIV care calibrated to longitudinal data from The Academic Model Providing Access To Healthcare (AMPATH) in Kenya, we simulated HBCT campaigns between 2016 and 2036, assessing the impact and total cost of care for each, for a further 20 years.Results:We find that simulating five equally spaced rounds averts 1.53 million disabilityadjusted lifeyears (DALYs) at a cost of $1617 million. By altering the timing of HBCT rounds, a fourround campaign can produce greater impact for lower cost. With “frontloaded” rounds, the cost per DALY averted is reduced by 12% as fewer rounds are required ($937 vs. $1060). Furthermore, improvements to HBCT coverage and linkage to care avert over two million DALYs at a cost per DALY averted of $621 (41% less than the reference scenario).Conclusions:Countries implementing HBCT can reduce costs by optimally timing rounds and generate greater health outcomes through improving linkage, coverage, and retention. Tailoring HBCT campaigns to individual settings can enhance patient outcomes for minimal cost.
AU - Olney,JJ
AU - Eaton,J
AU - Braitstein,P
AU - Hogan,J
AU - Hallett,T
DO - 10.1002/jia2.25142
PY - 2018///
SN - 1758-2652
TI - Optimal timing of HIV home-based counselling and testing rounds in Western Kenya
T2 - Journal of the International AIDS Society
UR -
UR -
VL - 21
ER -