Foot and mouth disease is common in South Africa’s wildlife reserves. There are constant efforts to make sure it doesn’t spread to farmed animals. But since 2019 the country has seen repeated outbreaks on farms. In 2026 the country’s R80 billion (US$5 billion) beef industry faced a crisis as unchecked outbreaks spread to all provinces. This caused a 26% drop in exports of beef in 2025, heavily affecting trade with China in particular. The lack of a mandatory, nationwide system to trace diseases like this means they can’t be effectively managed. We asked Tania Prinsloo, who has researched disease surveillance systems, to explain what’s gone wrong.