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BSL-4 is the highest level of international bioresearch safety.

Some U.S. officials have promoted the idea that the outbreak may have been started inadvertently through a leak at a bioresearch facility in Wuhan, although researchers say this is unlikely and not supported by any public evidence.

A spokeswoman for Mr. Collins on Friday pointed to statements that he made during a hearing in 2016 about bioresearch labs that disclosed that he founded and led a lab company.

If they come together with a full commitment for cancer cures, the city’s future bioresearch legacy could make its past pinpoints on the map of global significance seem quaint.

Becerra says they used a fictitious bioresearch company to meet with women’s healthcare providers and covertly record them.