Mexico City has been in a state of maximum alert since mid-December, with more than 90 percent of hospital beds full due to soaring infections. Non-essential activities have been suspended in the capital.
Anvisa, which has stipulated an efficacy rate of at least 50% for vaccines in the pandemic, has already pressed Butantan for more details of its study, after it filed for emergency use authorization on Friday.
"The situation is serious," said Perfeito, who noted that "the central problem is not the lack of money, but the lack of a clear plan" in a country that still does not have a start date for vaccinations against Covid-19.
Airlines are seeking at least 14 days before new requirements take effect and "consideration of inadequate testing and results availability in specific countries rather than a blanket worldwide requirement is also needed," the letter said.