As the SARS-Cov-2 pandemic continues into its second year, few aspects of it have become as politically charged as the theories swirling around the Wuhan Institute of Virology.
That lab has been a focus of suspicion since the earliest days of the COVID-19 crisis, primarily because it's a high-level coronavirus research lab that sits just a few miles from where the Chinese government said the first known outbreak of the disease occurred in an outdoor wet market.
The seemingly improbable coincidence has led to suspicions that a risky coronavirus experiment may have been the source of an accidental leak of the virus from the lab into, first, Wuhan itself, then the wider world.
Leaders from across the globe are calling for a thorough investigation into the lab's experiments, its security protocols and its internal records. Here's what is known about the Wuhan Institute of Virology so far.