The Bulletin of the World Health Organization is an international journal of public health with a special focus on developing countries. Since it was first published in 1948 the Bulletin has become one of the world's leading public health journals. As the flagship periodical of the World Health Organization (WHO) the Bulletin draws on WHO experts as editorial advisers reviewers and authors as well as on external collaborators. In this month's issue: The WHO research agenda for influenza: two years later; Influenza at the beginning of the 21st century; The population-based burden of influenza-associated hospitalization in rural western Kenya 2007-2009; Likely effectiveness of pharmaceutical and non-pharmaceutical interventions for mitigating influenza virus transmission in Mongolia; za-associated mortality in 2009 in four sentinel sites in Bangladesh; luenza-associated mortality in temperate and subtropical Chinese cities 2003-2008; Integrating pneumonia prevention and treatment interventions with immunization services in resource-poor countries; Application of a healthy food markets guide to two Indonesian markets to reduce transmission of avian flu ; Improving influenza surveillance in sub-Saharan Africa; Epidemic and intervention modelling - a scientific rationale for policy decisions? Lessons from the 2009 influenza pandemic; Developing pandemic preparedness in Europe in the 21st century: experience evolution and next steps; Population-based active surveillance cohort studies for influenza: lessons from Peru.