Covid-19 vaccine that is "100 percent Brazilian" was launched on Friday with more than a hint of political posturing.Sao Paulo's Butantan biomedical institute announced in the morning it is developing a vaccine and expects to start using it in July.Several hours later a minister said President Jair Bolsonaro's government had submitted a request for authorization to start clinical trials on a different vaccine.Butantan is the largest vaccine producer in Brazil and makes the CoronaVac shot produced by Chinese firm Sinovac -- the most widely used against the pandemic in the South American country.The institute is also heavily backed by Sao Paulo state governor Joao Doria, who is widely expected to challenge Bolsonaro in next year's general.