Geospatial and phylogenetic clustering of acute and recent HIV infections in Lilongwe, Malawi
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
HIV transmission during early HIV infection impedes efforts to end HIV as a public health threat, as diagnosis typically occurs after this period of elevated transmission risk. To guide diagnosis and prevention strategies, we evaluated the geospatial and phylogenetic clustering of acute and recent HIV infection in Lilongwe, Malawi. We identified people with acute (pre-seroconversion) HIV infection (AHI) and a random sample of people with post-acute HIV infection who presented to a sexually transmitted infections (STI) clinic in Lilongwe, Malawi between 2015 and 2019. We evaluated infection recency in people with post-acute HIV using a LAg-Avidity assay. We mapped the household locations of people with AHI and identified geospatial clusters using a flexible scan statistic. We constructed consensus sequences from deep sequencing reads to identify phylogenetic clusters through genetic distance thresholds and maximum likelihood trees. We identified 141 people with AHI, 30 people with recent HIV, and 652 people with chronic (non-recent) HIV. We identified four geospatial clusters that contained the residences of 30% of clinic attendees with AHI, despite comprising just 0.8% of the populated land area and 3.5% of the population. We also identified fourteen distinct two-person phylogenetic clusters. Ten of the fourteen were male-female pairs, nine of which were clinic referral pairs. The remaining four were same-sex pairs who had not referred each other to the clinic and may have been missing network intermediaries. Three of the fourteen phylogenetic pairs consisted of only acute/recent members, and zero phylogenetic linkages were located within geospatial clusters. AHI detection programs anchored in STI clinic populations and their neighborhoods could facilitate identification of early HIV infection, enabling treatment initiation and transmission prevention efforts during this most infectious period. Future studies of intervention packages and deployment approaches can help inform the optimal design and implementation of AHI-focused strategies for reducing HIV incidence.
Editor(s)
Shin, Sanghyuk S
Date Issued
2025-11-05
Date Acceptance
2025-10-16
Citation
PLOS Global Public Health, 2025, 5 (11)
ISSN
2767-3375
Publisher
Public Library of Science (PLoS)
Journal / Book Title
PLOS Global Public Health
Volume
5
Issue
11
Copyright Statement
© 2025 Bell et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
License URL
Identifier
https://www.ncbi.nlm.nih.gov/pubmed/41191620
PII: PGPH-D-25-01598
Subjects
ACT
CLINICS
Life Sciences & Biomedicine
Public, Environmental & Occupational Health
RISK
ROADS
Science & Technology
SPREAD
STAGE
SUB-SAHARAN AFRICA
TRANSMISSION
Publication Status
Published
Coverage Spatial
United States
Article Number
e0005420
Date Publish Online
2025-11-05