Redefining the Wash Resistance Index to predict insecticidal durability of mosquito nets.

Olé Skovmand; Duoc Dang; Trung Q. Tran; Rune Bosselmann; Sarah J Moore

January 1, 2026

Redefining the Wash Resistance Index to predict insecticidal durability of mosquito nets.

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Key Points

Improving the prediction of insecticidal durability allows for longer-lasting mosquito nets and better malaria control.
The analysis indicates that excluding the first wash from the wash resistance index (WRI) enhances its predictive ability for durability.
A new metric, the wash-off rate index (WORI), intuitively expresses the average wash-off across initial washes.
Understanding production and storage effects can refine assessment techniques for mosquito net longevity.

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Implication

Analysis shows improved predictions of insecticidal durability in mosquito nets, suggesting better metrics are needed.

Abstract

Excluding the first wash from WRI improves prediction of WR20. First-wash loss reflects production and storage effects rather than intrinsic wash resistance. Wash resistance can be more intuitively expressed as the Wash-Off Rate Index (WORI), representing average wash-off between washes 1-5.

Redefining the Wash Resistance Index to predict insecticidal durability of mosquito nets.

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Redefining the Wash Resistance Index to predict insecticidal durability of mosquito nets.

Key Points

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

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