The 15-year-old is said to be being treated in the intensive care unit of a hospital in Boa Vista, the capital of Roraima, the northern state of Brazil, where much of the Yanomami reserve is located.
The teenager was admitted last Friday for chest pain, breathing difficulties and a sore throat and tested positive for the disease on Tuesday.
Authorities say boy – who allegedly traveled to Yanomami reserve last month after school breaks – is one of seven native Brazilians tested positive for coronavirus in three Amazon states: Pará, Amazonas and Roraima.
Public health experts have warned that the coronavirus could wreak havoc on indigenous groups in countries like Brazil, Peru and Venezuela. Highly infectious diseases such as measles, smallpox and influenza viruses have a long and horrible experience of decimating these communities.