As forecasts showed 3000 people a day will soon be dying from the virus in the US.
The United States reached 400,000 confirmed coronavirus cases on Wednesday according to the Johns Hopkins University tally.
The US set another record with 1,850 deaths in a single day on Tuesday.
Amazonian teen tests positive for coronavirus
The 15-year-old's diagnosis brings the Amazon's COVID-19 count to seven, with local Indigenous leaders accusing unregulated miners of introducing the virus to their communities.
A Yanomami Indigenous boy has been diagnosed with COVID-19, sparking fears that the coronavirus is spreading throughout Indigenous communities in the Amazon.
The 15-year-old from the north-eastern Brazilian state of Roraima is the seventh Indigenous person to be diagnosed in the Amazon - all confirmed within the past week.
