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California Patient Contracted Coronavirus From No Known Origin, CDC Says

Positivity     50%   
   Negativity   50%
The New York Times
SOURCE: https://www.huffpost.com/entry/cdc-coronavirus-california-community-spread_n_5e573b89c5b66137fb5d9023
Write a review: The Huffington Post
Summary

The person had not been abroad and had no known contact with an infected person. The agency said it may be the first "community spread" case in the U.S.

As said here by Nick Visser