UMMS Affiliation
Department of Medicine, Division of Infectious Diseases and Immunology
Publication Date
2011-08-14
Document Type
Article
Disciplines
Immunology and Infectious Disease | Influenza Humans | Life Sciences | Medicine and Health Sciences | Public Health
Abstract
Objectives:
(1) To characterize the epidemiology of H1N1-related hospitalizations in Massachusetts; and (2) to compare characteristics of those hospitalized during periods of seasonal influenza activity and during the H1N1 pandemic.
Methods:
Authors applied maximum and minimum criteria to the Massachusetts Hospital Discharge Database to identify H1N1-related hospitalizations. They constructed annual line graphs describing mean frequencies of influenza-like illness(ILI)-related discharges between 2005-2008, and compared these rates to early waves of H1N1 in 2009.
Results:
During spring and summer 2009, there were significantly higher rates of ILI-related hospital discharges in Massachusetts compared to 2005-2008. Out of 359,344 total discharges between April 26-September 30,2009, H1N1-related hospitalizations ranged from 601 to 10,967 cases. Minimum criteria confirmed that H1N1 affected a younger population (50% were <18>years), with higher rates among African-Americans (18%) and Hispanics (23%) and higher rates of ICU admission (21%) compared to seasonal influenza (39%, 10%, 14%, and 17% respectively).
Conclusions:
This is the first population-based assessment of epidemiological characteristics of hospitalized H1N1 cases in Massachusetts, and it is the first to include all possible hospitalized cases in the analysis. The authors confirm that large administrative data sets can detect hospitalizations for influenza during a pandemic, but estimated case counts vary widely depending on selection criteria used. Maximum criteria overestimated H1N1 activity, and those meeting minimum criteria resemble published accounts of H1N1-related hospitalizations closely.
Rights and Permissions
This research note is distributed under the Creative Commons Attribution 3.0 license.
DOI of Published Version
10.1371/currents.RRN1256
Source
PLoS Curr. 2011 Aug 14;3:RRN1256. Link to article on publisher's website
Journal/Book/Conference Title
PLoS Currents
Related Resources
PubMed ID
21858253
Repository Citation
Placzek H, Madoff LC. (2011). Identification of Influenza Cases During the H1N1 Pandemic in Massachusetts Using Population-Based Hospital Discharge Data. GSBS Student Publications. https://doi.org/10.1371/currents.RRN1256. Retrieved from https://escholarship.umassmed.edu/gsbs_sp/1750