By Pedro Fonseca
RIO DE JANEIRO, BRAZIL - Brazil’s Covid-19 vaccination program is being put at risk by people failing to show up for their second shot, with 1.5 million people missing appointments for the follow-up dose needed to maximize protection, according to the Health Ministry.
Specialists say that is particularly concerning after a recent real-world study from Chile found that the Sinovac vaccine, which has accounted for some 80% of Brazil's program, is just 16% effective after one shot.
“Without the two doses, we get neither full protection nor a long duration of protection . . .
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