In early 2004, following an epidemic of avian influenza A/H5N1 in human, an outbreak of influenza A/H3 occurred in 5 communes at Hung Yen province with 887 cases and no deaths. This outbreak developed quickly but only in medium geographical range (inter-commune). Most cases are of school-age (from 5 to 19 years old) which comprise over 85% of the total number and focus mainly in primary and secondary schools. Owing to discovered early the outbreak, consisted of determinate the reasons and response to outbreak quickly and strongly and applied routinely to prevention the spread through the respiratory, and it also the good lesson to the prevention of outbreak
Disease Outbreaks ; Influenza, Human ; epidemiology

Humans ; Influenza, Human/epidemiology* ; Pandemics

China ; Disease Outbreaks ; Humans ; Influenza B virus ; Influenza, Human ; epidemiology

Humans ; Influenza A Virus, H1N1 Subtype ; Influenza, Human ; epidemiology ; virology

Humans ; Influenza A Virus, H1N1 Subtype ; Influenza, Human ; epidemiology ; virology

Humans ; Influenza A Virus, H1N1 Subtype ; Influenza, Human ; epidemiology ; virology

Evolution, Molecular ; Humans ; Influenza A virus ; genetics ; Influenza, Human ; epidemiology

During the past 100 years, there had been four global pandemics on influenza that had greatly influenced the health and life of the people. This article summarized the features, experiences and lessons learned on these four influenza pandemics so as to prepare related measures targeting the possible pandemics/epidemics in the foreseeable future, in China.
China ; Humans ; Influenza A Virus, H1N1 Subtype ; Influenza, Human/epidemiology* ; Pandemics

Cost of Illness ; Humans ; Influenza, Human ; economics ; epidemiology

Influenza is an acute respiratory infectious disease caused by influenza virus. It usually exhibits seasonal transmission, but the novel influenza strain can lead to a pandemic with severe human health and socioeconomic consequences. Early warning of influenza epidemic is an important strategy and means for influenza prevention and control. On the basis of reviewing the main influenza surveillance and early warning systems, this study summarizes the principles, applications, advantages and disadvantages, and development prospects of common influenza early warning models, in order to provide reference for research and application of early warning technology for influenza and other acute respiratory infectious diseases.
Humans ; Influenza, Human/epidemiology* ; Pandemics/prevention & control*