‘How did we catch it?’: spread of COVID baffles locked-down Shanghai residents

After the entire city was shut down on April 1, her family of four scrupulously followed government orders to stay at home, stepping out the front door only for mandatory PCR testing.
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When curbs were relaxed slightly in mid-April, letting residents walk about within their compounds, Veronica and her neighbours all wore masks.
For weeks, their housing estate was free of COVID.
But in late April, after what Veronica thinks was her 12th PCR test, she, another member of her family, and a handful of neighbours tested positive.
“I have no idea how we caught it,” said Veronica, who declined to give her full name, citing privacy.