Brazilian President Jair Bolsonaro says he has tested positive for the novel coronavirus after months of playing down the severity of the virus.
The right-wing populist told a group of television reporters he developed symptoms at the weekend.
"It started on Sunday with a certain malaise and became worse throughout the day on Monday, feeling poorly, exhaustion, a bit of muscle ache, fever hit 38 (degrees Celsius)," he said on Tuesday.
Finishing the interview, he stepped back and removed his mask to reveal a smile.
"You can see from my face that I'm well and I'm calm," he said.
Mr Bolsonaro said he has been taking hydroxychloroquine, an anti-malarial drug with unproven effectiveness against COVID-19.
Mr Bolsonaro has emulated his political role model Donald Trump in voicing skepticism about the virulence of the virus, even as the pandemic killed more than 65,000 people in his country.
Mr Bolsonaro tested negative in March for the coronavirus after several aides were diagnosed following a visit to Trump's Mar-a-Lago resort.
Jair Bolsonaro carries a child during a protest against Brazil's National Congress to back his open-the-economy drive in May. Source: AAP
The positive test on Tuesday looks set to spark a frantic period of contact tracing and tests for those who met Mr Bolsonaro in recent days, including Economy Minister Paulo Guedes, lender Banco Bradesco's chairman Luiz Carlos Trabuco and planemaker Embraer's chief executive Francisco Gomes Neto.
Over the weekend, Mr Bolsonaro was also in close contact with US Ambassador Todd Chapman during 4 July celebrations.
Pictures showed neither wearing a mask.
Brazilian financial markets retreated following the news.
Brazil's currency, the real, swung into negative territory and the benchmark stock index deepened losses to 1.5 per cent.
Brazil has the world's second-largest outbreak behind the US, with more than 1.6 million confirmed cases.
Mr Bolsonaro has drawn criticism from public health experts for fighting state and city efforts to impose social distancing, arguing that the economic damage of those orders is worse than the disease itself.
He has fired two health ministers during the crisis, both trained doctors, and replaced them with an active duty army general on an interim basis.
He joins a list of government leaders to become infected with the coronavirus, including British Prime Minister Boris Johnson and Honduran President Juan Orlando Hernandez, both of whom were treated in hospital and needed extra oxygen.
Pan American Health Organization director for communicable diseases Marcos Espinal wished Mr Bolsonaro a "speedy recovery" but said his infection carried a message.
"The message is that this virus is unpredictable and does not respect race, class or people in power, despite security around any president," Mr Espinal said.
"For Brazil, the infection of its president should reinforce the need to strengthen implementations of social distancing recommendations and the use of masks to mitigate the spread of coronavirus," he added.
Mr Bolsonaro has often defied local guidelines to wear a mask in public, even after a judge ordered him to do so in late June.
Mr Bolsonaro has also railed against social distancing rules supported by the World Health Organization.
