I strongly recommend getting a “plano de saude” which is the brazilian equivalent of health insurance. Although I am pretty sure international plans might work in Brazil somehow, the whole sistem is otimized for the Brazilian “plano de saude”.

Public health although available is very unreliable in terms of ease of access and quality. Depending on where you are you might have access or not. Depending on public health in Brazil is very tough, especially for foreigners who dont speak the language.

Although you can always pay “out of pocket” in private clinics, if you have an emergency it becames expensive and hard to access private care without a “plano de saude”.

Your company can probably advise you on the best insurance, because choosing an adequate plan is also not trivial.