DIFF Biotech's Innovative Nasal Spray Influenza Vaccine Receives Clinical Trial Approval, Introducing a New Attenuation Pathway
HANGZHOU, China, Feb. 9, 2026 /PRNewswire/ -- Zhejiang Difference Biological Technology Co., Ltd. (DIFF Biotech) announced that its proprietary nasal spray influenza attenuated live vaccine, DIFF-flu, has recently received clinical trial approval as...