Epidemiological and genetic characteristics of norovirus outbreaks in long-term care facilities, 2003-2006

N A Rosenthal, L E Lee, B A J Vermeulen, K Hedberg, W E Keene, M-A Widdowson, P R Cieslak, J Vinjé

Research output: Contribution to journalArticle

Abstract

To identify the epidemiological and genetic characteristics of norovirus (NoV) outbreaks and estimate the impact of NoV infections in an older population, we analysed epidemiological and laboratory data collected using standardized methods from long-term care facilities (LTCFs) during 2003-2006. Faecal specimens were tested for NoV by real-time reverse transcriptase-polymerase chain reaction. NoV strains were genotyped by sequencing. Of the 234 acute gastroenteritis (AGE) outbreaks reported, 163 (70%) were caused by NoV. The annual attack rate of outbreak-associated NoV infection in LTCF residents was 4%, with a case-hospitalization rate of 3·1% and a case-fatality rate of 0·5%. GII.4 strains accounted for 84% of NoV outbreaks. Median duration of illness was longer for GII.4 infections than non-GII.4 infections (33 vs. 24 h, P<0·001). Emerging GII.4 strains (Hunter/2004, Minerva/2006b, Terneuzen/2006a) gradually replaced the previously dominant strain (Farmington Hills/2002) during 2004-2006. NoV GII.4 strains are now associated with the majority of AGE outbreaks in LTCFs and prolonged illness in Oregon.

Original languageEnglish
JournalEpidemiology and Infection
Volume139
Issue number2
Pages (from-to)286-94
Number of pages9
ISSN0950-2688
DOIs
Publication statusPublished - Feb-2011

Keywords

  • Caliciviridae Infections/epidemiology
  • Disease Outbreaks
  • Genotype
  • Humans
  • Long-Term Care
  • Norovirus/genetics
  • Residential Facilities/organization & administration
  • Seasons

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