Last year's swine flu vaccine safe, report says

According to a study published in the of the New England Journal of Medicine, people who have been given the swine flu shot for the 2009-2010 season are not at an increased risk of developing Guillain-Barre syndrome

"If anybody still thinks that pig viruses cause Guillain-Barre at an increased rate, this study shows that's not the case," Dr. Marc Siegel of New York University said, according to BusinessWeek.com.

Dr. Siegel said that the current 2010-2011 seasonal vaccine should be safe as well, BusinessWeek.com reports.

Close to 100 million doses of the H1N1 flu vaccine were administered in China in 2009 and 2010. Chinese scientists have concluded that there is no pattern of serious side effects.

For the study, a team led by Dr. Yu Wang from the National Immunization Program in Beijing collected data from throughout China. The results showed adverse reactions in 90 out of one million cases. Of those, only 73 out of one million could be proven to be related to the vaccine, according to BusinessWeek.com.

Eleven cases of Guillain-Barre syndrome were found among the vaccinated, translating to a rate of 0.1 cases per million, lower than normal rate of the disease in China.

"These findings suggest that the H1N1 vaccine has a reasonable safety profile, and there is no evidence that the vaccine is associated with an increased risk of the Guillain-Barre syndrome," the scientists reported, according to BusinessWeek.com.