SAN JOSE, Calif. — New data from medical records in Los Angeles indicate COVID-19 may have been circulating in the United States even before China informed the World Health Organization of the first outbreak of the then-unidentified virus, according to researchers at UCLA and the University of Washington.In a study published Thursday in the Journal of Medical Internet Research, the team of nine researchers compared electronic medical records in the UCLA Health system from this winter to the previous five years and found an excess number of outpatient and emergency room visits with complaints o...
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