False information from the mouths of politicians and preachers is reaching remote villages in the Amazon via WhatsApp, reports BBC News Brasil's Juliana Gragnani.

A helicopter loaded with health workers and coronavirus vaccine doses took off from Labrea, in the southern part of the Amazon, heading to a village some 50km away. 

But the villagers, part of the indigenous Jamamadi group, greeted the chopper armed with bows and arrows - and demanded that it leave. 

They'd been hearing false rumours about vaccines and wanted reassurances from a religious missionary - not doctors - before getting jabbed. The helicopter left without administering any of the doses.