Early surveillance and mass SARS-CoV-2 testing throughout Guangdong: > 1.6 million tests were performed in ~2 months.
Jing: Nanopore sequencing was particularly effective at detecting SARS-Cov-2 in samples with low viral loads.
Most COVID-19 cases in Guangdong were linked to travel, not local transmission.
Strategies for successfully containing COVID-19 in Guangdong: extensive testing, active tracing, strict isolation.
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