A nationwide research is undergoing to determine the possible causes of complications from H1N1 vaccine. But these claims are being disputed by leading health experts.

The research data has identified symptoms of Guillain-Barre syndrome which can lead to paralysis and death, Bell’s palsy, which can lead to temporary facial paralysis, and thrombocytopenia, a condition which leads to a low level of platelets in the blood.

Experts have argued that it is still too early to determine if these reports are true and they need a deeper analysis. An expert committee has already given permission to follow up on the initial reports.

But various experts argue that swine flu still is too big a threat to be ignored at any cost. They argue that prevention of an outbreak is still an important priority with the government.

Around 400 million people throughout the world have been given this vaccine, which includes around 80 million Americans, to control the outbreak of swine flu. But health experts confirm that the vaccine is safe and has already been given to millions around the world.

The World Health Organization, based in Geneva and a part of United Nations, has already launched two investigations into reports that it had heightened the amount of risk posed by the swine flu epidemic.