GSBS Student Publications

Student Author(s)

Hilary Placzek

UMMS Affiliation

Department of Medicine, Division of Infectious Diseases and Immunology

Date

8-14-2011

Document Type

Article

Medical Subject Headings

Influenza, Human; Influenza A Virus, H1N1 Subtype; Hospitalization; Epidemiologic Factors; Massachusetts

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

Citation: PLoS Curr. 2011 Aug 14;3:RRN1256. Link to article on publisher's website

DOI of Published Version

10.1371/currents.RRN1256

Comments

This research note is distributed under the Creative Commons Attribution 3.0 License.

Related Resources

Link to article in PubMed

Journal Title

PLoS Currents

PubMed ID

21858253

Share

COinS
 
 

To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.