South African rand.RapidEye | iStock | Getty ImagesThe South African rand on Friday fell sharply against the dollar after a new variant with many mutations was detected in the country.The currency fell to as low as 16.2391 against the greenback during Asia trading hours on Friday and was last trading about 1.6% weaker at 16.2215 per dollar.The losses came as investors scurried toward safe-haven currencies such as the Japanese yen, which strengthened about 0.6% against the greenback to 114.69 per dollar. The U.S. dollar index, which tracks the greenback against its peers, was at 96.712 — as compared with levels below 96.5 seen earlier this week.World Health Organization officials said Thursday they are monitoring a new variant with numerous mutations to the spike protein — the part of the virus that binds to cells in the body. The health agency is scheduling a special meeting Friday to discuss what it may mean for vaccines and treatments.The variant, called B.1.1.529, has been detected in South Africa in small numbers, according to the WHO.”We don’t know very much about this yet. What we do know is that this variant has a large number of mutations. And the concern is that when you have so many mutations, it can have an impact on how the virus behaves,” Dr. Maria Van Kerkhove, WHO’s technical lead on Covid-19, said in a Q&A that was livestreamed on the organization’s social media channels.Hours following the announcement, the United Kingdom announced it would temporarily suspend flights from six African countries.— CNBC’s Hannah Miao contributed to this report.