In the first trail of the two H1N1 vaccines used in the UK during the recent pandemic is reported to have discovered that the swine flu vaccines vaccine extended higher immune response rates in young children, however, was linked with further reactions than the whole virus vaccine.

The Health Protection Agency carried the study with the Universities of Bristol, Oxford, Southampton, Exeter, and St George's in London.

The study is revealed to involve 900 plus children in the age bracket of six months and 12 years from the five cities. Researchers revealed that children responded well and most side effects were minor during the study period.

In the study, the Department of Health used H1N1 vaccines for the national immunisation programme, an adjuvanted split virion vaccine obtained from egg culture and a non-adjuvanted whole virion vaccine from cell culture.

Kids categorized on the basis of their age were made to receive either the split vaccine or the whole virus vaccine in two doses, 21 days apart in a randomized order.

Researchers reveal that 98% of children under three responded well to two doses of the "adjuvanted" vaccine, which included agents that helped in boosting immunity.

The study was published in the British Medical Journal today.