The likelihood of infection with pandemic H1N1 2009 influenza is strongly influenced by age; the young are at most risk and those aged [60 years at least risk. Approximately 60% of patients with confirmed H1N1 2009 influenza virus infection are aged 16-64 years. However, case fatality increases with age especially those with associated co-morbidities, the young children \5 years of age [5] and pregnant where it is also high (Table 2B) .