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The article presents a study which focuses on the public health challenges of the 2009 H1N1 influenza pandemic. It looks at the H1N1 pdm modeling conducted during the first meeting of an informal network convened by the World Health Organization (WHO) in the U.S. Pubic health challenges include measuring age-specific immunity to infection, improving treatment outcomes for severe cases and quantifying the effectiveness of interventions. Ways on meeting those public challenges are also discussed.

Presents letters to the editor of 'British Medical Journal.' Discussion of the policy of this journal concerning clinical trials without economic evaluations; Self help smoking cessation in pregnancy; Advocation of the World Health Organization for investment in global infrastructure for outbreaks such as smallpox; Possible use of polyspecific snake antivenom in Africa; Randomized controlled trial for twin delivery with planned Cesarean section; Thrombolysis with recombinant streptokinase in Cuba; Suggestion that checklists for myocardial infarction be precise; Copying letters to patients and omitting information.