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Norm’s note:

The research group of French professor Didier Raoult has recently shown that at a cycle threshold (ct) of 25 , about 70% of samples remained positive in cell culture (ie were infectious); at a ct of 30 , 20% of samples remained positive; at a ct of 35 , 3% of samples remained positive; and at a ct above 35 , no sample remained positive (infectious) in cell culture ( see diagram ). (source: HERE)