The World Health Organization (WHO) has warned that countries hit by the novel coronavirus should still be alert at all times and enact stricter controls on the spread of the virus to avoid more deaths. Michael Ryan, head of the WHO Emergencies Program, said the infection rate is still high, while another WHO official said 29 percent of COVID-19 samples showed it is mutating as shown in sample D614G, which could speed up replication and spread of the virus.

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