title: Respiratory viral infections in institutions from late stage of the first and second waves of pandemic influenza A (H1N1) 2009, Ontario, Canada.
abstract: We report the impact of respiratory viruses on various outbreak settings by using surveillance data from the late first and second wave periods of the 2009 pandemic. A total of 278/345(78·5%) outbreaks tested positive for at least one respiratory virus by multiplex PCR. We detected A(H1N1)pdm09 in 20·6% of all reported outbreaks of which 54·9% were reported by camps, schools, and day cares (CSDs) and 29·6% by long-term care facilities (LCFTs), whereas enterovirus/human rhinovirus (ENT/HRV) accounted for 62% outbreaks of which 83·7% were reported by long-term care facilities (LCTFs). ENT/HRV was frequently identified in LTCF outbreaks involving elderly residents, whereas in CSDs, A(H1N1)pdm09 was primarily detected.
authors.affiliation: The Hospital for Sick Children, Toronto, ON, Canada.
authors.forename: Sandra
authors.initials: S
authors.lastname: Asner
authors.forename: Adriana
authors.initials: A
authors.lastname: Peci
authors.forename: Alex
authors.initials: A
authors.lastname: Marchand-Austin
authors.forename: Anne-Luise
authors.initials: AL
authors.lastname: Winter
authors.forename: Romy
authors.initials: R
authors.lastname: Olsha
authors.forename: Erik
authors.initials: E
authors.lastname: Kristjanson
authors.forename: Donald E
authors.initials: DE
authors.lastname: Low
authors.forename: Jonathan B
authors.initials: JB
authors.lastname: Gubbay
mesh_terms: D000293:Adolescent; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002656:Child Day Care Centers; D002675:Child, Preschool; D004196:Disease Outbreaks; D004770:Enterovirus / Q000235:genetics / Q000302:isolation & purification*; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000235:genetics / Q000302:isolation & purification*; D007251:Influenza, Human / Q000453:epidemiology* / Q000821:virology; D008297:Male; D009735:Nursing Homes; D009864:Ontario / Q000453:epidemiology; D058873:Pandemics; D012141:Respiratory Tract Infections / Q000453:epidemiology* / Q000821:virology; D012229:Rhinovirus / Q000235:genetics / Q000302:isolation & purification*; D012574:Schools