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An unnamed US female gymnast has tested positive for Covid-19, Inzai city official Takamitsu Ooura told CNN.

The teenage gymnast is staying in Inzai City in Chiba Prefecture, Japan, for pre-camp ahead of the Tokyo Olympics which start on Friday.

She tested positive on Sunday and her doctor confirmed the test result after another test Monday.

The gymnast has no symptoms and is quarantined in her hotel room as she waits for the public health center to decide on whether or not to hospitalize her.