Pneumonia and Influenza Mortality Surveillance(2017)

Pneumonia and Influenza Mortality Surveillance(2017)

Many parts of the world reported outbreaks of pandemic influenza A (H1N1) starting from April 2009. Soon after the World Health Organization (WHO) announced the case definition for H1N1 influenza on April 26, 2009, Taiwan CDC categorized H1N1 influenza as a Class 1 notifiable communicable disease on April 27 for the purpose of surveillance. WHO branded the flu outbreak as a ''gentle pandemic'' because the majority of H1N1 influenza cases had only mild symptoms. Thus, Taiwan reclassified H1N1 influenza from Class 1 to Class 4 notifiable communicable disease on June 19, 2009. Therefore, cases of influenza A (H1N1) infection with severe complications are handled under the Class 4 notifiable communicable disease regulation.