The study found that Norwegians aged 30 or younger who were infected with the H1N1 influenza virus, or hospitalised with influenza, during the 2009-2010 pandemic were twice as likely to go on to develop type 1 diabetes (T1D) than the general population.
T1D is a chronic autoimmune disease in which the immune system destroys the cells needed to control blood-sugar levels.
More than 65,000 new cases of type 1 diabetes are diagnosed worldwide annually. Yet the exact cause of T1D is not clear, researchers at Norwegian Institute of Public Health in Norway said.
Infection with H1N1 influenza has previously been linked with the development of autoimmune disorders including narcolepsy.
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In the new study, Paz Lopez-Doriga Ruiz and colleagues analysed health registries of the whole Norwegian population aged 30 years and under between June 2009 (when a wave of pandemic influenza H1N1 spread across Norway) and June 2014, to investigate whether pandemic influenza diagnosis is linked with increased risk of T1D.
Following the 2009 pandemic, 2,376 individuals were diagnosed with T1D, researchers found.
This association was even stronger in children aged 15 years or younger - who had a 25 per cent increased chance of developing type T1D.
Results also showed that Norwegians with laboratory confirmed H1N1 influenza, or who were hospitalised with an influenza diagnosis during the pandemic season had a doubled risk of later developing type 1 diabetes compared to the general Norwegian population, researchers said.
In contrast, those diagnosed with influenza-like illness in primary care were not at significantly increased risk of developing T1D, they said.
"This study may support the hypothesis that respiratory infections can contribute to the development of type 1 diabetes, due to stress and inflammation in predisposed individuals," researchers said.
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