RIO DE JANEIRO, BRAZIL - At least 70 percent of Brazilians need to be immunized before we can start talking about an end to the Covid-19 epidemic in the country. Reaching this percentage will only be feasible after the majority of the population has been infected and cured.
The alternative is to have a vaccine, which will almost certainly not reach the market before the end of the year.
To anticipate how or when we will reach this level is an exercise in futurology. There is no precedent in recent human history for the current crisis, thus, one cannot look . . .