Summarybackground Pyrethroid resistance can be considered the main threat to the continued control of many mosquito vectors of disease. Piperonyl butoxide (PBO) has been used as a synergist to help increase the efficacy of certain insecticides. This enhancement stems from its ability to inhibit two major metabolic enzyme systems, P450s and non-specific esterases, and to enhance cuticular penetration of the insecticide.objective To compare the mortality of a characterized resistant Aedes aegypti strain, Nha Trang, from Vietnam and the susceptible laboratory strain Bora Bora on netting with the pyrethroid deltamethrin (DM) alone and in combination with PBO.methods Resistance mechanisms were characterized using molecular and bioassay techniques; standard PCR was used to test for the kdr target site mutation. Potential genes conferring metabolic resistance to DM were identified with microarray analysis using the Ae. aegypti 'detox chip'. These data were analysed alongside results from WHO susceptibility tests. P450, CYP9J32, was significantly overexpressed in the DM-resistant strain compared with the susceptible Bora Bora strain. Another five genes involved with oxidative stress responses in mosquitoes were also significantly overexpressed. The Nha Trang strain was homozygous for two kdr mutations. WHO cone bioassays were used to investigate mortality with incorporated DM-treated nets with and without PBO. PBO used in combination with DM resulted in higher mortality than DM alone.conclusion Synergists may have an important role to play in the future design of vector control products in an era when alternatives to pyrethroids are scarce.

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Research teams in high-income countries often fail to acknowledge the capacity and contributions of Community Researchers. This qualitative exploratory study used decolonising methodology and the Foundation House ‘Refugee Recovery Framework’ to understand Community Researchers’ perceptions and experiences of their role, and how research teams can integrate the knowledge they bring into research. Purposive sampling was used to facilitate the recruitment of eight Community Researchers from five different community groups working in Melbourne, Victoria. Semi-structured interviews lasting forty to sixty minutes occurred between December 2020 and January 2021. Data were analysed using reflexive thematic analysis. Findings reported in this paper include eight themes: ‘nothing about us without us’; ‘open the door’; a safe space to share; every step of the way; this does not translate; finding the right way to ask; a trauma-informed approach; and support within the workplace. The knowledge obtained demonstrates that Community Researchers facilitate meaningful participation in research for women, families, and communities of refugee or migrant background. Community Researchers’ presence, knowledge, and skills are vital in establishing culturally safe research practices and developing accessible language to facilitate conversations about sensitive research topics across multiple languages. Community Researchers can make important contributions at all stages of research, including data collection and interpretation.

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