FILE PHOTO: Brazil's President Jair Bolsonaro reacts as he leaves Alvorada Palace, amid the coronavirus disease (COVID-19) outbreak in Brasilia, Brazil May 5, 2020. REUTERS/Ueslei Marcelino/File Photo

BRASILIA: The biggest threat to Brazil's ability to successfully combat the spread of the coronavirus and tackle the unfolding public health crisis is the country's president, Jair Bolsonaro, according to British medical journal The Lancet.