All across the Asia-Pacific region, the countries that led the world in containing the coronavirus are now languishing in the race to put it behind them.

While the United States, which has suffered far more grievous outbreaks, is now filling stadiums with vaccinated fans and cramming airplanes with summer vacationers, the pandemic champions of the East are still stuck in a cycle of uncertainty, restrictions and isolation.

In southern China, the spread of the delta variant led to a sudden lockdown last week in Guangzhou, a major industrial capital. Taiwan, Vietnam, Thailand and Australia have also clamped down after recent outbreaks, while Japan is dealing with its own weariness from a fourth round of infections, spiked with fears of viral disaster from the Olympics.