https://www.nature.com/articles/d41586-023-00283-y
The World Health Organization (WHO) has quietly shelved the second phase of its much-anticipated scientific investigation into the origins of the COVID-19 pandemic, citing ongoing challenges over attempts to conduct crucial studies in China, Nature has learned.

Researchers say they are disappointed that the investigation isn’t going ahead, because understanding how the coronavirus SARS-CoV-2 first infected people is important for preventing future outbreaks. But without access to China, there is little that the WHO can do to advance the studies, says Angela Rasmussen, a virologist at the University of Saskatchewan in Saskatoon, Canada. “Their hands are really tied.”