Aerial images of Hong Kong residents forming long queues over the weekend for Covid testing as the city faces its worst coronavirus wave to date. For more than two years, Hong Kong has followed China's zero-Covid strategy, but a wave of the highly transmissible Omicron virus variant has battered the city's capacity for testing, quarantine and treatment. No place in the world has managed to return to zero Covid cases after such an outbreak except mainland China, which has imposed citywide lockdowns and mass stay-at-home orders when even a handful of cases are detected. IMAGES