JOURNAL ARTICLE

Epidemiology of multiple respiratory viruses in childcare attendees

Emily T Martin, Mary P Fairchok, Zach J Stednick, Jane Kuypers, Janet A Englund
Journal of Infectious Diseases 2013 March 15, 207 (6): 982-9
23288925

BACKGROUND: The identification of multiple viruses during respiratory illness is increasing with advances in rapid molecular testing; however, the epidemiology of respiratory viral coinfections is not well known.

METHODS: In total, 225 childcare attendees were prospectively followed for up to 2 years. Nasal swabs were collected at respiratory illness onset and every 7-10 days until illness resolution. Swabs were tested by polymerase chain reaction for 15 respiratory viruses and subtypes.

RESULTS: At least 1 virus was detected in 382 (84%) of 455 new-onset illnesses with multiple viruses identified in 212 (46%). The proportion of subject swabs with multiple viruses detected changed as respiratory illnesses progressed from week to week, as did the prevalence of individual viruses. Children with multiple viruses detected at the time of illness onset had less frequent fever (odds ratio [OR], 0.56; 95% confidence interval [CI], 0.35, 0.90), however, these children more often had illness symptoms lasting over 7 days (OR, 1.94; 95% CI, 1.20, 3.14).

CONCLUSIONS: A high proportion of daycare attendees had multiple viruses detected during respiratory illnesses. Delay between onset of illness and viral detection varied by virus, indicating that some viruses may be underrepresented in studies of virus epidemiology that rely on only a single test at symptom onset.

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