### Abstract

The traditional method for assessing the severity of influenza seasons is to estimate the associated increase (i.e., excess) in pneumonia and influenza (P&I) mortality. In this study, excess P&I hospitalizations were estimated from National Hospital Discharge Survey Data from 26 influenza seasons (1970-1995). The average seasonal rate of excess P&I hospitalization was 49 (range, 8-102)/100,000 persons, but average rates were twice as high during A(H3N2) influenza seasons as during A(H1N1)/B seasons. Persons aged <65 years had 57% of all influenza-related hospitalizations; however, the average seasonal risk for influenza-related P&I hospitalizations was much higher in the elderly than in persons aged <65 years. The 26 pairs of excess P&I hospitalization and mortality rates were linearly correlated. During the A(H3N2) influenza seasons after the 1968 pandemic, excess P&I hospitalizations declined among persons aged <65 years but not among the elderly. This suggests that influenza-related hospitalizations will increase disproportionately among younger persons in future pandemics.

Originalsprog | Engelsk |
---|---|

Tidsskrift | Journal of Infectious Diseases |

Vol/bind | 181 |

Udgave nummer | 3 |

Antal sider | 7 |

ISSN | 0022-1899 |

Status | Udgivet - 2000 |

Udgivet eksternt | Ja |

## Citer dette

Simonsen, L., Fukuda, K., Schonberger, L. B., & Cox, N. J. (2000). The Impact of Influenza Epidemics on Hospitalizations.

*Journal of Infectious Diseases*,*181*(3).