Coronavirus: Hong Kong records first untraceable local case involving Covid-19 mutated strain 6 hours ago Hundreds of residents from Tung Chung’s Caribbean Coast estate will undergo three weeks of quarantine The patient’s infection carried the N501Y and E484K mutations, both found in strains first identified in South Africa and Brazil 20 mins ago 1 hour ago 3 hours ago 3 hours ago 6 hours ago 29 Apr, 2021 Block 11 of Caribbean Coast was locked down for testing ahead of residents being sent to quarantine. Photo: SCMP/Felix Wong Hong Kong has recorded its first untraceable local cases of a mutated Covid-19 strain. Hundreds of occupants of a 52-storey residential block in Tung Chung have been ordered into quarantine after a woman was confirmed to be carrying two more infectious strains.