RIO DE JANEIRO, BRAZIL - Countries will have to coexist with the resumption of social isolation actions for up to two years, in order to prevent an explosion of Covid-19 cases.

This is the estimated average time frame for large-scale immunization of populations. This is the opinion of the doctor and vice-director of the Pan American Health Organization (PAHO), Jarbas Barbosa, Tuesday's guest of the series 'Estadão Live Talks'. The PAHO is the World Health Organization's (WHO) arm in the Americas.

"The most optimistic talk about developing a vaccine by the end of the year . . .

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