Cillian De Gascun, head of then National Virus Reference Laboratory, joins to discuss what we know so far about monkeypox. The virus has gained a foothold in many Western countries, and the World Health Organisation has now declared it a public health emergency. How is it spreading, who is most at risk, and why is the vaccine used to protect against it in such short supply?The Explainer is brought to you by The Journal. Providing open access to valuable journalism in Ireland has been the aim of The Journal for a decade. You can contribute to ensure we can keep questioning, investigating, debunking, explaining and informing at www.thejournal.ie/contribute/