Activity Brief.Formative research revealed that gold miners in remote regions of Guyana viewed malaria as an unavoidable and minor risk compared to other dangers. Building on these insights, Breakthrough ACTION co-created the 'Lil Mosquito, Big Problem' (LMBP) social and behavioural change campaign, which targeted miners in malaria-endemic areas (Regions 7 and 8). Adopting a human-centred design approach, the campaign collaborated with the Ministry of Health, mining organisations, and miners throughout its development. LMBP used visual, low-literacy materials featuring animated and live-action characters to raise awareness of the risks of malaria and encourage key behaviours such as timely testing, adhering to treatment and consistently using insecticide-treated nets. Launched in 2019 and scaled up until 2024, this multi-channel campaign aimed to change attitudes and improve malaria prevention in these hard-to-reach communities. Accessed on 20/06/2025.