Swine flu vaccine left over from the winter 2009/2010 vacination campaign expires these days and therefore has to be disposed. Due to the content of mercury added as Thimerosal (also known as Thiomersal) to most of the vaccines that depending on the manufacturer can reach 25-50 ppm in the vaccine, the left overs have to be handled as "hazardous waste".
Link:
http://www.speciation.net/News/Unused-swine-flu-vaccine-turns-into-hazardous-waste-;~/2010/04/14/4970.html
Old pandemic flu vaccines may plug shortfall, PM says
The government is considering using leftover vaccine from the swine flu pandemic to plug the shortfall in jabs this winter, the prime minister says.
Link:
http://www.bbc.co.uk/news/health-12122879
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