South Africa President Cyril Ramaphosa is receiving treatment after testing positive for Covid-19, his office says.
In a statement, it says the 69-year-old has mild symptoms and is isolating in Cape Town.
South Africa has seen a surge of infections since the new Omicron variant was first detected in November.
Despite Omicron being more transmissible than previous strains, including Delta, risk of severe disease and death is lower, a study has found.