What caused this British company to suspend the trial of the new vaccine from corona-Sina.com

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1. Why did this British company suspend the trial of the new corona vaccine?
2. World’s first new corona nasal spray vaccine made in China enters clinical trials – IT y Salud cnBeta
3. Prevent the new crown without injection? HKU Deutsche Welle Nasal Spray Vaccine Trial in November
4. Mainland China and Hong Kong jointly develop first nasal spray vaccine to enter clinical trials
5. ◤Global pandemic◢ University of Hong Kong and China develop nasal spray vaccine in clinical trials China Press
6. See the full report on Google News