Interdisciplinary research between psychology, microbiology and education has resulted in the co-creation of ‘A Germ’s Journey’ (), a free at the point of access resource-based handwashing education intervention workshop comprising of books, web games, videos, lesson plans and posters. The resources are utilised globally across Africa, Asia and Europe, with 6,000 books having been donated to schools, museum exhibits, community centres and refugee camps and the website being accessed in 117 countries. Overall the project has reached 200,000 people thus far. A Germ’s Journey has led to improvements in handwashing behaviour in children, enhanced knowledge of microorganism transfer in children, and reduced diarrhoea and vomiting associated with poor hygiene particularly in India. The resources have also been developed in response to the Covid-19 pandemic, with a children’s book and dementia-friendly book being created, a handwashing app (in collaboration with SureWash) for children and hand-hygiene resources (Soaper Stars) for use in paediatric wards.