Amid what appears to be an explosive outbreak of COVID-19, China on Wednesday said it would no longer report asymptomatic cases because they’ve become “impossible” to track after an end to mandatory testing.

The now-voluntary testing policy is part of an abrupt pivot away from the country’s strict zero-COVID policy that drew widespread protests in recent weeks.

After years of keeping SARS-CoV-2 outbreaks largely at bay with various restrictions, mandatory isolations, quarantines, lockdowns, and extensive testing, China last week significantly eased its unpopular policy. The State Council announced on December 7 that residents would no longer be required to undergo frequent PCR tests for COVID-19. It also dropped the requirement to use digital health passes—personal QR codes that tracked an individual’s movements and COVID-19 test results—for access to buildings and public transportation. And for the first time during the pandemic, the government also allowed people with mild or asymptomatic infections to isolate at home rather than in centralized facilities, which residents often criticized for being unsanitary and overcrowded.