A new breath test which measures the immunity to swine flu (H1N1) could ease future shortages of the vaccine by identifying those who already have the strain. The test measures biomolecules which body produces in response to the virus.

A study revealed that more than half the people vaccinated in Glasgow during the Swine Flu pandemic were already infected with the virus and therefore had been vaccinated unnecessarily. It is thought that this proportion is representive of the rest of the country.

If introduced, its hoped that shortages as seen during the last Swine Flu outbreak will not repeat themselves.