Dressed in a hazmat suit, two masks and a face shield, Du Mingjun knocked on the mahogany door of a flat in a suburban district of Wuhan on a recent morning.
A man wearing a single mask opened the door a crack and, after Du introduced herself as a psychological counselor, burst into tears.
"I really can't take it anymore," he said. Diagnosed with the novel coronavirus in early February, the man, who appeared to be in his 50s, had been treated at two hospitals before being transferred to a quarantine center set up in a cluster of apartment blocks in an industrial part of Wuhan.
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