Influenza, human epidemiology 2 Chronic disease epidemiology 1 Climate change statistics and numerical data 1 Communicable disease epidemiology 1 Communicable disease, emerging epidemiology 1 Epidemiology manpower 1 Epidemiology statistics and numerical data 1 Immunologic tests methods 1 Influenza, human diagnosis 1 Influenza, human virology 1 Manual for the laboratory diagnosis and virological surveillance of influenza 1 Pandemics prevention and control 1 Practice guideline 1 Research design methods 1 Serologic tests methods 1 Socioeconomic factors 1 South-East Asia 1 World Health Organization 1 population surveillancr methods 1