Chinese researchers at the Wuhan Institute of Virology discovered a new bat coronavirus, HKU5 CoV-2, that binds to the same receptor as SARS-CoV-2. The finding boosted vaccine stocks, with shares of Moderna, Novavax, Pfizer, and BioNTech rising. Shi Zhengli said, "We must remain vigilant," emphasizing the need for robust vaccine development.