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Spring 2009 H1N1 influenza outbreak in King County, Washington.
Disaster Med Public Health Prep. 2009 Dec; 3 Suppl 2:S109-16.DM

Abstract

BACKGROUND

In April 2009, King County, Washington, experienced a sustained outbreak of 2009 H1N1 influenza A. This report describes the epidemiology of that outbreak in King County, home to a diverse population of 1.9 million people.

METHODS

The 2 primary sources of data are case investigations of reported laboratory-confirmed 2009 H1N1 influenza A and a population-based syndromic surveillance system that captures data from emergency departments (EDs). A syndromic category for influenza-like illness was defined based on chief complaint and diagnosis.

RESULTS

ED visits for influenza-like illness peaked quickly in the first week of the outbreak and remained high for approximately 6 weeks, with school-age children accounting for the greater number of ED visits, followed by young adults. Children ages 0 to 4 years had the highest rate of hospitalization. Among reported cases, blacks, Asians, and Hispanics were more likely to be hospitalized. Predisposing factors associated with admission were immune compromise, chronic lung disease, chronic heart disease, pregnancy, diabetes, and asthma. Of people receiving antiviral treatment, 34% started their medication more than 2 calendar days after the onset of illness. Mean days between illness onset and antiviral treatment were greater for blacks, Hispanics, and foreign language speakers.

CONCLUSIONS

The spring 2009 influenza A H1N1 outbreak disproportionately affected children, young adults, and racial and ethnic minorities. Opportunities exist to improve the timeliness of antiviral treatment. Potential barriers to care for racial and ethnic minorities should be proactively addressed to ensure prompt evaluation and treatment.

Authors+Show Affiliations

Public Health-Seattle & King County, 401 Fifth Ave, CNK-0900, Seattle, WA 98104, USA. tao.kwan-gett@kingcounty.govNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

19952883

Citation

Kwan-Gett, Tao Sheng, et al. "Spring 2009 H1N1 Influenza Outbreak in King County, Washington." Disaster Medicine and Public Health Preparedness, vol. 3 Suppl 2, 2009, pp. S109-16.
Kwan-Gett TS, Baer A, Duchin JS. Spring 2009 H1N1 influenza outbreak in King County, Washington. Disaster Med Public Health Prep. 2009;3 Suppl 2:S109-16.
Kwan-Gett, T. S., Baer, A., & Duchin, J. S. (2009). Spring 2009 H1N1 influenza outbreak in King County, Washington. Disaster Medicine and Public Health Preparedness, 3 Suppl 2, S109-16. https://doi.org/10.1097/DMP.0b013e3181c6b818
Kwan-Gett TS, Baer A, Duchin JS. Spring 2009 H1N1 Influenza Outbreak in King County, Washington. Disaster Med Public Health Prep. 2009;3 Suppl 2:S109-16. PubMed PMID: 19952883.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Spring 2009 H1N1 influenza outbreak in King County, Washington. AU - Kwan-Gett,Tao Sheng, AU - Baer,Atar, AU - Duchin,Jeffrey S, PY - 2009/12/3/entrez PY - 2009/12/17/pubmed PY - 2010/3/17/medline SP - S109 EP - 16 JF - Disaster medicine and public health preparedness JO - Disaster Med Public Health Prep VL - 3 Suppl 2 N2 - BACKGROUND: In April 2009, King County, Washington, experienced a sustained outbreak of 2009 H1N1 influenza A. This report describes the epidemiology of that outbreak in King County, home to a diverse population of 1.9 million people. METHODS: The 2 primary sources of data are case investigations of reported laboratory-confirmed 2009 H1N1 influenza A and a population-based syndromic surveillance system that captures data from emergency departments (EDs). A syndromic category for influenza-like illness was defined based on chief complaint and diagnosis. RESULTS: ED visits for influenza-like illness peaked quickly in the first week of the outbreak and remained high for approximately 6 weeks, with school-age children accounting for the greater number of ED visits, followed by young adults. Children ages 0 to 4 years had the highest rate of hospitalization. Among reported cases, blacks, Asians, and Hispanics were more likely to be hospitalized. Predisposing factors associated with admission were immune compromise, chronic lung disease, chronic heart disease, pregnancy, diabetes, and asthma. Of people receiving antiviral treatment, 34% started their medication more than 2 calendar days after the onset of illness. Mean days between illness onset and antiviral treatment were greater for blacks, Hispanics, and foreign language speakers. CONCLUSIONS: The spring 2009 influenza A H1N1 outbreak disproportionately affected children, young adults, and racial and ethnic minorities. Opportunities exist to improve the timeliness of antiviral treatment. Potential barriers to care for racial and ethnic minorities should be proactively addressed to ensure prompt evaluation and treatment. SN - 1938-744X UR - https://www.unboundmedicine.com/medline/citation/19952883/Spring_2009_H1N1_influenza_outbreak_in_King_County_Washington_ L2 - http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=19952883.ui DB - PRIME DP - Unbound Medicine ER -