Brazil‘s recently elected president Jair Bolsonaro is in semi-intensive care after being struck down with pneumonia.

The far-right leader, who took office in January, first went to hospital to remove a colostomy bag, which was put in place after he was stabbed in the stomach during the election campaign.

He had been expected to only spend a few days in hospital, but doctors said he then developed a fever and pneumonia-like symptoms.

“He underwent a tomography of the chest and abdomen that showed a good evolution of the intestinal frame and images compatible with pneumonia,” a statement from the Albert Einstein hospital in Sao Paolo said.

Mr Bolsonaro’s spokesman said the president was now expected to remain in hospital until next week and he was being treated in the semi-intensive care unit with a 38C fever.

Brazil election: far-right candidate Jair Bolsonaro wins Presidency Show all 8 1 /8 Brazil election: far-right candidate Jair Bolsonaro wins Presidency Brazil election: far-right candidate Jair Bolsonaro wins Presidency A man holds an inflatable figure of jailed former president Luiz Inacio Lula da Silva as supporters of far-right presidential candidate Jair Bolsonaro celebrate in front of the National Congress in Brasilia, after the former army captain won Brazil's presidential election AFP/Getty Brazil election: far-right candidate Jair Bolsonaro wins Presidency Supporters of the left-wing presidential candidate for the Workers Party (PT), Fernando Haddad, react in Rio AFP/Getty Brazil election: far-right candidate Jair Bolsonaro wins Presidency Police officers patrol the streets during a gathering of supporters of the left-wing presidential candidate for the Workers Party AFP/Getty Brazil election: far-right candidate Jair Bolsonaro wins Presidency Fernando Haddad, presidential candidate of Brazil's leftist Workers Party (PT), is kissed by his wife Ana Estela Haddad Reuters Brazil election: far-right candidate Jair Bolsonaro wins Presidency epa07128316 Supporters of Socialist candidate Fernando Haddad react after he was defeated by far-right candidate Jair Bolsonaro, in Rio de Janeiro, Brazil, 28 October 2018. With 99.4 percent of ballots counted, Bolsonaro won the second round of the elections with 55.1 percent of the votes, compared to 44.9 percent obtained by Fernando Haddad, successor of Luiz Inacio Lula da Silva and candidate of the PT, or Workers Party. EPA/JULIO CESAR GUIMARAES JULIO CESAR GUIMARAES EPA Brazil election: far-right candidate Jair Bolsonaro wins Presidency Supporters of the left-wing presidential candidate for the Workers Party (PT), Fernando Haddad, react in Rio de Janeiro, Brazil, after the far-right candidate Jair Bolsonaro won Brazil's presidential election, in Rio de Janeiro, Brazil, on October 28, 2018. - Far-right former army captain Jair Bolsonaro was elected president of Brazil on Sunday, beating leftist opponent Fernando Haddad in a runoff election after a bitter and polarized campaign. Official results gave the controversial president-elect 55.18 percent of the vote with more than 99.7 percent of the ballots counted. (Photo by Daniel RAMALHO / AFP)DANIEL RAMALHO/AFP/Getty Images DANIEL RAMALHO AFP/Getty Images Brazil election: far-right candidate Jair Bolsonaro wins Presidency Supporters of far-right presidential candidate Jair Bolsonaro, celebrate in front of the National Congress in Brasilia, after the former army captain won Brazil's presidential election, according to official results that gave him 55.7 percent of the vote, on October 28, 2018. - Far-right former army captain Jair Bolsonaro was elected president of Brazil on Sunday, beating leftist opponent Fernando Haddad in a runoff election after a bitter and polarized campaign. Official results gave the controversial president-elect 55.18 percent of the vote with more than 99.7 percent of the ballots counted. (Photo by Sergio LIMA / AFP)SERGIO LIMA/AFP/Getty Images SERGIO LIMA AFP/Getty Images Brazil election: far-right candidate Jair Bolsonaro wins Presidency Supporters of Jair Bolsonaro gather outside the Federal Police headquarters where Brazilâ€™s former President Luiz Inacio Lula da Silva is serving a prison sentence, after Bolsonaro wins the presidential race in Curitiba, Brazil October 28, 2018. REUTERS/Rodolfo Buhrer RODOLFO BUHRER REUTERS

But the controversial president has reassured Brazilians he is not seriously unwell.

In a tweet he said: “Be careful not to be sensationalist. We are very relaxed, well and remain steady.”

Doctors said although Mr Bolsonaro was not able to eat solid food, he was doing walking exercises and was not in pain.

The presidential spokesman also said the 63-year-old was looking forward to a meal of steak and chips when he was discharged.

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Under the Brazilian constitution, the vice president, retired general Hamilton Mourao, would step in should Mr Bolsonaro be unable to carry out his duties.