RIO DE JANEIRO, BRAZIL - Amid the race for a Covid-19 vaccine, a handful of countries such as the United Kingdom, the United States and Canada have taken the lead and started to immunize their populations.
The vaccine chosen by all so far is Pfizer/BioNTech's, the first to disclose efficacy results and to be registered by a regulatory agency following the standard protocols. Other countries, like Russia and China, have already begun emergency vaccination of part of their populations, with immunizers still under study.
Countries that have signed agreements with leading pharmaceutical companies are now awaiting the completion . . .