Antibody test suggests coronavirus hit U.S. in December 2019

Two residents of Snohomish County, Washington, have tested positive for antibodies against the novel coronavirus after developing symptoms similar to COVID-19 in December 2019, several weeks prior to the country's first confirmed case in mid-January.

One of the residents reportedly developed symptoms, including dry cough, fever and body aches, shortly after Christmas last year, and improved after seeking for medical help. At the time, no COVID-19 patient and suspected case had been reported in the United States.

The patient recently learned from her family doctor that her blood test has shown positive for novel coronavirus antibodies, The Seattle Times reported.

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