A delta-driven surge in COVID-19 cases is coming to a faster-than-expected end in Japan, but experts warn another wave of infections may be just around the corner.

The country's fifth wave was the most explosive yet and wreaked havoc on the nation’s health care system.

But the surge has subsided significantly since its mid-August peak. Health ministry data shows there were 2,661 new cases confirmed nationwide on Saturday, a dramatic drop from the middle of last month when the daily tally routinely topped 20,000 and peaked over 25,000.