Shanghai, which is reeling under a massive outbreak of coronavirus cases, has released over 11,000 recovered COVID-19 patients from hospitals, but infection numbers continued to climb, raising questions about China’s much-touted dynamic zero-case policy.

Wu Qianyu, a senior official with the east Chinese city’s public health commission, told a media briefing on Sunday that the patients would be put under home quarantine and no further controls should be imposed on them.