Recent studies on risk factors for influenza A(H1N1) 2009 deaths concluded that the majority of severe pandemic cases as well as fatalities had underlying medical conditions as previously also associated with severe seasonal influenza [4, 8, [18] [19] [20] [21] [22] . Our results are in line with previous studies in which respiratory disorders and immunosuppressive conditions were frequently reported as underlying diseases [4] [5] [6] 18, 21] . Furthermore, neurological disorders have been reported to be common underlying diseases in fatal pandemic influenza cases, especially in children and young adults [5, 19] . Patients with neurological and neuromuscular disease have also been recognized as high-risk group for severe disease from seasonal influenza [23] .