Federal officials cited the end of the Covid-19 pandemic in halting the research. But much of the work was focused on preventing outbreaks of other pathogens.
A religious organization recruited him to help open New York City's first independent abortion clinic, though it was unaware that Louisiana had taken away his license.
The F.D.A. approved an artificial vessel to restore blood flow in patients, despite its own scientists flagging questionable study results and potentially fatal ruptures of the product.