What touched off the COVID-19 pandemic remains a mystery. Several dominant hypotheses exist, but each lacks sufficient evidence to explain the cause of the crisis.
A growing number of experts are calling for further investigation in the Chinese city of Wuhan, where the outbreak is widely believed to have started. However, the scientific inquiry is being marred by political tensions between Washington and Beijing.
However, Biden recently renewed COVID-19 origin probe and the U.S. intelligence agencies are now pursuing rival theories potentially including the possibility of a laboratory accident in China.