CoronaVac does not need to be frozen, and both the vaccine and raw material for formulating the new doses could be transported and refrigerated at 2—8 °C 36—46 °F , temperatures at which flu vaccines are kept.
The recommendation was given with limited evidence at the time of approval for groups other than healthy adults.
A political showdown began in October 2020, when Bolsonaro vetoed a deal between the Brazilian health ministry and the São Paulo government for the purchase of 46 million doses of the vaccine.