The virus’s origin does not affect many parts of the fight against Covid. The best mitigation strategies — travel restrictions, testing, contact tracing, social distancing, ventilation and masking — are still the best mitigation strategies.

But there are at least three concrete ways, in addition to the inherent value of truth, in which the origin matters.

First, if the virus really did come from a lab, an immediate airing of the details might have led to even faster vaccine development and more effective treatments. Second, a leak that caused millions of deaths could lead to widespread change in laboratories’ safety precautions. Third, confirmation of a leak would affect the world’s view of China — and would put pressure on China to bear the burden of vaccinating the world as quickly as possible.