Marc Lipsitch, an epidemiologist at the Harvard T.H. Chan School of Public Health in Boston, says that the draft recommendations provide more clarity, but do not address the fundamental concerns that the BU study raises. The final policy should cover any ePPP research done at any US institution — not just research funded by HHS — and should allow for the additional review step to occur if potential for an ePPP to be created becomes apparent, even after the project is funded, he says.

Researchers hope that the update will provide clearer direction on which SARS-CoV-2 research needs NIH approval, and how the agency conducts its extra review. As Shi and his team develop COVID-19 antivirals, he would like to study how readily the virus can evolve mutations to evade drugs, and whether mutations linked to existing drugs can foil new ones. But he says that he has not yet received clear guidance from the NIH on what experiments he can and cannot do.

In some cases, discussions seem to be driven by publicity surrounding experiments such as the BU study, instead of by considerations of the potential risks and benefits of such work, says Bloom. The latest controversy highlights the disconnect between how scientists and the public perceive the risk of research into certain pathogens, he adds. “It’s important for scientists to recognize it’s the general public that’s funding all this research. And there are good reasons that people want more transparency and understanding.”