Taking "engineered in a lab" to mean modern genetic technology, there are possibilities beyond that and all-natural. Remember that we modified wild polio to cre

Taking "engineered in a lab" to mean modern genetic technology, there are possibilities beyond that and all-natural. Remember that we modified wild polio to create a vaccine many decades ago, long before modern genetic technology. Passing bat viruses through human cell lines would not leave any kind of mark to indicate intentional modification.