As the COVID-19 virus has spread worldwide, much attention has been paid to its impact on the health and wellbeing of adults, with less attention to how the virus has impacted on young children. This article draws on documentation and video data from a kindergarten in Aotearoa New Zealand. It discusses the working theories of 4 year-old children whose teachers encouraged them to draw, construct images, explain and tell stories about their experiences, ideas and feelings about the virus. A main argument is that children's working theories about the virus, knowledge of the virus and sense of personal control over keeping themselves safe developed over time. Arts-based and storytelling pedagogy were central in enabling children to communicate with others, to be understood themselves and to extend their own understanding.