An investigation team conducting a review at the biopharmaceutical company CSL has revealed at a national immunization conference in Darwin on Wednesday that it was the manufacturing technique that had flaws causing adverse reactions in children.

It has been found that the firm had developed a flu vaccine in 2010, which when given to children below five years of age caused them to suffer some kind of seizures. Also, the same had caused it to face a ban on the drug, while an approval by the Therapeutic Goods Administration only for above 10s.

Children's immune system tended to respond so unnecessarily to the drug Fluvax that they suffered fevers and convulsions after taking it.

The inquest has found that while, some inactivated virus components were necessary to be involved in influenza vaccines. Since the same helps the immune system to activate and protect against the virus.

The manufacturing crew had probably put more components than needed, which triggered the immune system to respond much heavily.

Darryl Maher, CSL's vice-president of medical and research, has thus affirmed that the company needs to bring a change in the process of manufacturing so as to stop putting children at risk. "We'll have to do clinical trials and that's going to take several years", added he.