Flooding overnight threatened a key production site of the Oxford/AstraZeneca vaccine in the UK as storm Christoph swelled rivers across the country. Local authorities in Wrexham, Wales, say they worked through the night, successfully holding off floods at an industrial site where the nationwide supply of the vaccine is put in vials. About 30 miles away, a river collapsed under floodwaters that sparked evacuations. The company, Wockhardt UK, said in a statement that they had experienced “mild flooding” and that “all necessary actions were taken with no disruption to manufacturing.” They said that they are now operating as normal.  Wrexham Borough Council said that Wockhardt contacted them for help yesterday evening. “We worked through the night with them and gave them the resources and it’s been successful, but it has been difficult,” said Council leader Mark Pritchard, according to LBC. “This could have had an impact on not just Wrexham and …