Pfizer Inc. has found a promising but early potential coronavirus treatment, which the drugmaker aims to begin testing in patients this summer.

Laboratory research suggests the drug candidate blocks the new coronavirus from replicating, Pfizer research-and-development chief Mikael Dolsten said in an interview. The findings indicate the experimental drug could slow or stop the spread of the virus in patients with mild-to-moderate symptoms, though human testing will be necessary for proof.

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