A single dose of the H1N1 swine flu vaccine was 93 percent effective during the 2009 pandemic.
A single dose of the H1N1 swine flu vaccine was 93 percent effective during the 2009 pandemic.
In order to assess the effectiveness of the H1N1 flu vaccine - known as the AS03-adjuvanted pandemic H1N1 vaccine - Canadian researchers looked at 552 patients of Canada with flu-like illness who visited clinics in four provinces between November 8 and December 5, 2009.
Pandemic H1N1 was detected in 209 (38 percent) of the patients with 40 percent of the cases occurring in children and young adults and 9 percent occurring in adults 65 and older. Two (1 percent) of the patients with H1N1 flu had received a single dose of the H1N1 vaccine at least two weeks before they became ill, compared with 58 (17 percent) of patients who didn't have H1N1 infection.
The findings show that the vaccine was 93 percent effective. The findings apply not only to Canada but other countries where vaccines were used, and may help guide the further development of influenza vaccine options.
More than 80 percent of the people in the study were children and adults younger than 50 years, so evidence of the effectiveness of the vaccine in the elderly is still needed.
In order to assess the effectiveness of the H1N1 flu vaccine - known as the AS03-adjuvanted pandemic H1N1 vaccine - Canadian researchers looked at 552 patients of Canada with flu-like illness who visited clinics in four provinces between November 8 and December 5, 2009.
Pandemic H1N1 was detected in 209 (38 percent) of the patients with 40 percent of the cases occurring in children and young adults and 9 percent occurring in adults 65 and older. Two (1 percent) of the patients with H1N1 flu had received a single dose of the H1N1 vaccine at least two weeks before they became ill, compared with 58 (17 percent) of patients who didn't have H1N1 infection.
The findings show that the vaccine was 93 percent effective. The findings apply not only to Canada but other countries where vaccines were used, and may help guide the further development of influenza vaccine options.
More than 80 percent of the people in the study were children and adults younger than 50 years, so evidence of the effectiveness of the vaccine in the elderly is still needed.
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