Brazil's President Jair Bolsonaro attends the flag-raising ceremony at his official residence in Brasilia, Brazil, July 22, 2020. Brazil's President Jair Bolsonaro again tested positive for the novel coronavirus, indicating he must remain in isolation, the president's office said on Wednesday. (Photo by Lucio Tavora/Xinhua)

Brazil's President Jair Bolsonaro attends the flag-raising ceremony at his official residence in Brasilia, Brazil, July 22, 2020. Brazil's President Jair Bolsonaro again tested positive for the novel coronavirus, indicating he must remain in isolation, the president's office said on Wednesday. (Photo by Lucio Tavora/Xinhua)

Brazil's President Jair Bolsonaro (R) walks to attend the flag-raising ceremony at his official residence in Brasilia, Brazil, July 22, 2020. Brazil's President Jair Bolsonaro again tested positive for the novel coronavirus, indicating he must remain in isolation, the president's office said on Wednesday. (Photo by Lucio Tavora/Xinhua)

Brazil's President Jair Bolsonaro attends the flag-raising ceremony at his official residence in Brasilia, Brazil, July 22, 2020. Brazil's President Jair Bolsonaro again tested positive for the novel coronavirus, indicating he must remain in isolation, the president's office said on Wednesday. (Photo by Lucio Tavora/Xinhua)