Military personnel load medical supplies onto a helicopter in Boa Vista, capital of Roraima state, Brazil, on June 30, 2020. A Brazilian military medical team is providing medical care to the indigenous people from June 30 to July 5, with services including COVID-19 tests. (Photo by Lucio Tavora/Xinhua)

Medical workers collect a sample from an indigenous person for COVID-19 test in Roraima state, Brazil, on June 30, 2020. A Brazilian military medical team is providing medical care to the indigenous people from June 30 to July 5, with services including COVID-19 tests. (Photo by Lucio Tavora/Xinhua)

Indigenous people wait for medical consultation in Roraima state, Brazil, on June 30, 2020. A Brazilian military medical team is providing medical care to the indigenous people from June 30 to July 5, with services including COVID-19 tests. (Photo by Lucio Tavora/Xinhua)

Indigenous people walk to receive medical consultation in Roraima state, Brazil, on June 30, 2020. A Brazilian military medical team is providing medical care to the indigenous people from June 30 to July 5, with services including COVID-19 tests. (Photo by Lucio Tavora/Xinhua)

A medic performs health check for indigenous people in Roraima state, Brazil, on June 30, 2020. A Brazilian military medical team is providing medical care to the indigenous people from June 30 to July 5, with services including COVID-19 tests. (Photo by Lucio Tavora/Xinhua)

Indigenous people walk to receive medical consultation in Roraima state, Brazil, on June 30, 2020. A Brazilian military medical team is providing medical care to the indigenous people from June 30 to July 5, with services including COVID-19 tests. (Photo by Lucio Tavora/Xinhua)