As new Covid-19 waves sweep across parts of East Asia, health experts are urging caution. In cities like Hong Kong and Singapore, both with high population density and major global travel hubs, Covid-19 infections are climbing again. The familiar rhythm of respiratory symptoms, hospital visits, and rising positivity rates is returning in these cities. While the world has moved on from the acute pandemic phase, this latest uptick is a sharp reminder: Covid has not vanished, and perhaps more importantly, neither has the risk it poses to our health systems or our wallets.