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The far right politician said that the contract that has been signed with the pharmaceutical company doesn't cover against side effects from the inoculation, including - and this is the bizarre part - people turning into crocodiles or women growing beards.
Just another normal day in the Bolsonaro household, it would seem.
To be fair, he's got previous for this sort of scepticism surrounding the coronavirus. He's described it as 'a little flu' and said that he wouldn't have the vaccine, despite being in charge of the country's huge vaccination programme.
However, these comments are by far his strangest yet.
On Thursday, Bolsonaro said: "In the Pfizer contract it's very clear: 'we're not responsible for any side effects.' If you turn into a crocodile, it's your problem.
"If you become superhuman, if a woman starts to grow a beard or if a man starts to speak with an effeminate voice, they [Pfizer] will not have anything to do with it."
The vaccine is currently undergoing testing in Brazil, but has already been approved for use in both the UK and the United States.
In launching his country's vaccination campaign, Bolsonaro said that it would be free for Brazilians to be immunised, but it would not be compulsory.
However, the Supreme Court ruled on Thursday that whilst they aren't going to force anyone to have the vaccine, it would be 'obligatory'.
That means that folks who do refuse to get the jab might end up with a fine, or be banned from certain public spaces.
It remains to be seen whether they'll impose those same rules on President Bolsonaro or not.
Brazil has struggled throughout the coronavirus pandemic, recording more than 7.1 million cases and around 185,000 deaths from a population of 212 million people.
President Bolsonaro said that once a vaccine is approved by their regulatory body, they'll be getting it out to the public, just not him.
He explained: "It will be available for everyone that wants it. But me, I won't get vaccinated."
"Some people say I'm giving a bad example. But to the imbeciles, to the idiots that say this, I tell them I've already caught the virus, I have the antibodies, so why get vaccinated?"
Bolsonaro had the virus back in July, and recovered in three weeks. However, it's not clear how long immunity lasts after having had the virus, and there have been cases of reinfection.
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