File Photo: President of Brazil Dilma Rousseff. (Reuters)
Brazil's President Dilma Rousseff has been sworn in for her second term.
She immediately faces tough challenges after taking the oath of office before Congress today.
She must spark a moribund economy that's seen paltry growth since she first took office in 2011.
She also has to deal with a rapidly expanding scandal over a kickback scheme at state-run oil company Petrobras, with allegations bribes made their way into her Workers' Party campaign coffers and those of allied parties.
The left-leaning Rousseff was re-elected in October in a tight race against a more conservative rival.
It's the seventh consecutive time a directly elected president has started a term in office - something the country hasn't seen in nearly a century.