Brazil's President Jair Bolsonaro has led a throng of motorcyclist supporters through the streets of Sao Paulo and been hit with a fine for failure to wear a mask.
Sao Paulo's state government press office said a fine - equivalent to about $US110 - ($A143)would be imposed for violation of a rule that has required masks in public places since May 2020.
Bolsonaro's office did not immediately respond to a request for comment. Bolsonaro, who tested positivie for the coronavirus last year, also was fined for failure to wear a mask during a rally with supporters in May in the northeastern state of Maranhao.
The conservative president waved to the crowd from his motorcycle and later spoke from atop a sound truck to helmeted but largely maskless backers.
They cheered and chanted while he insisted that masks were useless for those already vaccinated - an assertion disputed by most public health experts.
Vaccines are designed chiefly to protect recipients from getting sick, not necessarily from being infected. While studies show many vaccines reduce viral load and likely spread, not all varieties have been fully studied.
Less than 12 per cent of Brazil's population has received both doses of a COVID-19 vaccine, according to the Ministry of Health.
Australian Associated Press