What were the epidemiological features of the 2009 H1N1 pandemic?
The 2009 H1N1 pandemic was characterized by its rapid global spread and significant impact on public health. The virus predominantly affected younger populations, including children and young adults, which was unusual compared to seasonal influenza that typically affects older individuals. Epidemiologically, the virus had a relatively low case fatality rate but a high attack rate, meaning it infected a large number of people but resulted in a smaller proportion of deaths compared to other influenza strains.
