Independent vaccine company PowderJect Pharmaceuticals is to supply more flu vaccine to UK supermarket chain Asda following the success of an in-store vaccination campaign held on 12 October.

Wal-Mart subsidiary Asda reported that shoppers were queuing up for the vaccine even before it went on sale in some stores, with demand exceeding supply in a number of stores. The company now plans to offer thousands more flu vaccinations in 80 key stores on Saturday 9 November.