Toward the end of a book review by Scott Gottlieb in the Wall Street Journal comes this passage:
We now know that scientists at the Wuhan Institute were performing research on coronaviruses by infecting animals whose immune systems had been engineered to resemble that of humans—a line of research that could have helped a virus adapt to infect people. We know that there was an outbreak of a flulike illness at the institute in the fall of 2019, around the time the virus is believed to have made its jump to humans. We know that scientists at the Wuhan Institute conducted research on novel coronaviruses in labs that took only basic precautions to guard against spread outside the lab. And [the head of the Center for Emerging Infectious Diseases at the Wuhan Institute of Virology, Shi Zhengli] never disclosed to the World Health Organization the full sequences of the viruses she had in her possession. We don't know, for example, if the Wuhan Institute had the strain found in the pangolins in March 2019.
The search for Covid's origin seems to have stalled, which is lamentable.
Gottlieb's nudge in the book review might help in getting this search unstalled. Really getting to the bottom of it does seem to be possible, but would require a more vigorous effort by American government officials, advocacy groups, and news organizations. The Chinese Communist Party clearly doesn't want the information out there. Given the consequences—more than 6 million deaths worldwide, more than 1 million in the U.S.—you'd think there'd be more determination by the rest of the world to get to the cause. The Democrats generally seem content to leave it at blaming it on President Trump.