The Hong Kong government said Thursday that it had detected two cases of a new variant identified in South Africa, which scientists have warned shows a “big jump in evolution” and could limit the effectiveness of vaccines. The infections were detected in a man who had returned to Hong Kong from South Africa this month, and later in another man staying across the hall in the same quarantine hotel. (Hong Kong requires almost all overseas arrivals to quarantine in hotels for two to three weeks.) The virus’s genetic sequence was identical in both men, suggesting airborne transmission, according to…

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