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Published in: BMC Infectious Diseases 1/2021

Open Access 01-12-2021 | Tuberculosis | Research article

Community transmission of multidrug-resistant tuberculosis is associated with activity space overlap in Lima, Peru

Authors: David P. Bui, Shruthi S. Chandran, Eyal Oren, Heidi E. Brown, Robin B. Harris, Gwenan M. Knight, Louis Grandjean

Published in: BMC Infectious Diseases | Issue 1/2021

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Abstract

Background

Transmission of multidrug-resistant tuberculosis (MDRTB) requires spatial proximity between infectious cases and susceptible persons. We assess activity space overlap among MDRTB cases and community controls to identify potential areas of transmission.

Methods

We enrolled 35 MDRTB cases and 64 TB-free community controls in Lima, Peru. Cases were whole genome sequenced and strain clustering was used as a proxy for transmission. GPS data were gathered from participants over seven days. Kernel density estimation methods were used to construct activity spaces from GPS locations and the utilization distribution overlap index (UDOI) was used to quantify activity space overlap.

Results

Activity spaces of controls (median = 35.6 km2, IQR = 25.1–54) were larger than cases (median = 21.3 km2, IQR = 17.9–48.6) (P = 0.02). Activity space overlap was greatest among genetically clustered cases (mean UDOI = 0.63, sd = 0.67) and lowest between cases and controls (mean UDOI = 0.13, sd = 0.28). UDOI was positively associated with genetic similarity of MDRTB strains between case pairs (P < 0.001). The odds of two cases being genetically clustered increased by 22% per 0.10 increase in UDOI (OR = 1.22, CI = 1.09–1.36, P < 0.001).

Conclusions

Activity space overlap is associated with MDRTB clustering. MDRTB transmission may be occurring in small, overlapping activity spaces in community settings. GPS studies may be useful in identifying new areas of MDRTB transmission.
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Metadata
Title
Community transmission of multidrug-resistant tuberculosis is associated with activity space overlap in Lima, Peru
Authors
David P. Bui
Shruthi S. Chandran
Eyal Oren
Heidi E. Brown
Robin B. Harris
Gwenan M. Knight
Louis Grandjean
Publication date
01-12-2021
Publisher
BioMed Central
Published in
BMC Infectious Diseases / Issue 1/2021
Electronic ISSN: 1471-2334
DOI
https://doi.org/10.1186/s12879-021-05953-8

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