Complementation of contact tracing by mass testing for successful containment of beta COVID-19 variant (SARS-CoV-2 VOC B.1.351) epidemic in Hong Kong by Vincent Chi-Chung Cheng, Gilman Kit-Hang Siu, Shuk-Ching Wong, Albert Ka-Wing Au, Cecilia Suk-Fun Ng, Hong Chen, Xin Li, Lam-Kwong Lee, Jake Siu-Lun Leung, Kelvin Keru Lu, Hazel Wing-Hei Lo, Evelyn Yin-Kwan Wong, Shik Luk, Bosco Hoi-Shiu Lam, Wing-Kin To, Rodney Allan Lee, David Christopher Lung, Mike Yat-Wah Kwan, Herman Tse, Shuk-Kwan Chuang, Kelvin Kai-Wang To, Kwok-Yung Yuen

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