Brazil's president Jair Bolsonaro said he had started experiencing symptoms on Sunday. He said he had had a high temperature, a cough and had felt unwell. Photo: BBC News

He took the test, his fourth, on Monday after developing symptoms, including a high temperature.

Mr Bolsonaro has repeatedly played down risks of what he has called the "little flu", saying he would not be seriously affected. He has opposed lockdowns, which he says hurt the economy.

Brazil has the second-highest number of Covid-19 cases and deaths in the world, after the US.

What did Mr Bolsonaro say?

He made the announcement in a TV interview on Tuesday, saying the fever he had been experiencing had gone down and that he felt "very well".

Mr Bolsonaro said that he had started experiencing symptoms on Sunday. He said he had had a high temperature, a cough and had felt unwell.

He added that on Monday he had felt worse, which prompted him to take the coronavirus test.

Mr Bolsonaro is in a higher-risk group because of his age, 65.

He said he was taking hydroxychloroquine - championed by US President Donald Trump - and azithromycin, an antibiotic, to treat the illness. Neither has been proven to be effective against the virus.

Contact tracing and tests will be carried out for the people Mr Bolsonaro has met recently.

His previous three tests for the virus all came back negative.

The executive director of the World Health Organization, Dr Mike Ryan, wished President Bolsonaro "a speedy and full recovery from this disease", adding: "I think the message to us all is: we are vulnerable to this virus."

What had he previously said?

Back in April, Mr Bolsonaro said that even if infected, he would "not have to worry as I wouldn't feel anything, at most it would be like a little flu or a little cold".

The number of Covid-19-related deaths and infections - at that time under 3,000 and 40,000 - has since soared.

Despite this, President Bolsonaro has argued that regional lockdowns are having a more damaging effect than the virus itself, and accused the media of spreading panic and paranoia.