A paper of 20 April 2026 in PLOS Neglected Tropical Diseases reports a molecular survey of Ae. aegypti in Hargeisa, Berbera and Burao (Somaliland) after dengue upsurges in 2022–2024. Voltage-gated sodium-channel mutations S989P, V1016G and F1534C were found; WHO bioassays in Hargeisa and Burao showed resistance to the pyrethroids tested.
Main points
- Journal: PLoS Negl Trop Dis 20(4): e0014185. DOI 10.1371/journal.pntd.0014185. Received 13 June 2025; accepted 25 March 2026; published 20 April 2026.
- Adults and larvae were collected; species confirmed by COI; vgsc screened; WHO tests with deltamethrin, permethrin, lambda-cyhalothrin and alpha-cypermethrin on females from Hargeisa and Burao (2024).
- 24-hour mortality examples (Hargeisa): lambda-cyhalothrin 18%, deltamethrin 88%, alpha-cypermethrin 28%, permethrin 50% — all below the WHO susceptible threshold. The S989P/V1016G combination (more often reported in Asia) was present; mutation frequencies were higher in Burao.
- Blood-meal analysis detected human and goat DNA in a subset of samples. The paper is Somaliland data, not a survey in Vietnam.
VPMA’s note
These are research results from Somaliland. Do not use these resistance figures to describe mosquito populations in Vietnam.
- Source
- PLOS Neglected Tropical Diseases
- Published
- 20 April 2026
- Section
- Research · Insects
- Journal
- PLoS Negl Trop Dis 20(4): e0014185
- DOI
- 10.1371/journal.pntd.0014185
Editorial note: This is a short summary and comment by VPMA, not a full copy. The original text and copyright belong to the source cited. Picture: Figure 1 of the PLOS NTDs paper (sampling-site map).
Source: PLOS Neglected Tropical Diseases (summarised in English by VPMA). Read the Vietnamese page.