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Last updated on April 20, 2014 at 21:20 EDT

WHO Says Only One Dose Of H1N1 Vaccine Needed

October 30, 2009

World Health Organization officials on Friday announced that one dose of the H1N1 swine flu vaccine is all that is needed to ensure immunity against the virus.

The Strategic Advisory Group of Experts (SAGE) on Immunization devoted a session of its October 27-29 meeting to pandemic influenza vaccines.

“Items on the agenda included the status of vaccine availability, results from clinical trials on vaccine immunogenicity, and early results from safety monitoring in countries where administration of the H1N1 pandemic vaccine is currently under way,” WHO said on its Web site.

The group found that teens and young adults continue to account for the majority of H1N1 cases. Between 1 percent and 10 percent of patients with clinical illness require hospitalization, 10 percent to 25 percent of which require admission to an ICU unit.

Additionally, SAGE said that a single dose of the vaccine in adults and adolescents is recommended.

“All the reports received to date following vaccination — either in clinical trials or in mass vaccination campaigns — have shown that the safety profile of these pandemic vaccines is good and is very similar to the one which is known for seasonal influenza vaccine,” WHO expert Marie-Paule Kieny told reporters.

“Nothing special in terms of adverse events has been noted,” said Kieny.

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