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Vol. 43. Issue 5.
Pages 469-473 (September - October 2015)
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Vol. 43. Issue 5.
Pages 469-473 (September - October 2015)
Original Article
DOI: 10.1016/j.aller.2014.06.006
Hospital admission due to respiratory viral infections in moderate preterm, late preterm and term infants during their first year of life
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I. Olabarrietaa, E. Gonzalez-Carrascoa, C. Calvoa, F. Pozob, I. Casasb, M.L. García-Garcíaa,
Corresponding author
marialuz.hso@gmail.com

Corresponding author.
a Department of Neonatology and Department of Pediatrics, Severo Ochoa Hospital, Leganés, Madrid, Spain
b Influenza and Respiratory Viruses Laboratory, National Centre of Microbiology, Instituto de Salud Carlos III, Madrid, Spain
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Tables (4)
Table 1. Frequency of viruses detected in hospitalised preterm and term infants.
Table 2. Clinical characteristics associated with infections in preterm and term infants.
Table 3. Clinical characteristics of the patients who require paediatric intensive care (PICU) admission or not.
Table 4. Epidemiological and clinical characteristics during neonatal period of the preterm infants who require hospitalisation or not.
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Abstract
Background

Respiratory viral infections are a major cause of hospitalisation in infants <1 year and might cause severe symptoms in preterm infants. Our aim was to analyse admissions due to respiratory infections in moderate, late and term infants, and to identify risk factors for hospitalisation in preterm versus term.

Methods

Prospective study in a cohort of moderate and late preterm, and term infants born between October/2011 and December/2012. Admissions due to respiratory infections during the first year of life were analysed and compared among moderate (32–33), late (34–36) and term infants. Sixteen respiratory viruses were detected by RT-PCR. Clinical data were collected.

Results

30 (20.9%) out of 143 preterm infants required admission for respiratory infection, versus 129 (6.9%) of 1858 term infants born in the same period (p<0.0001, OR: 3.6 CI 2.0 to 5.0). Hospitalised children had a higher prevalence of hyaline membrane disease (HMD) at birth (p<0.001, OR: 7.7 CI: 2.121 to 27.954) and needed more mechanical ventilation (p<0.001, OR: 5.7 CI: 1.813 to 18.396). Virus was identified in 25/30 (83%) preterm babies, and in 110/129 (85%) term infants. The most frequent viruses in preterm infants were RSV (76%) rhinovirus (20%). Clinical and epidemiological characteristics among term and preterm infants were similar.

Conclusions

The risk of respiratory admissions during the first year of life is up to 3.6 times higher in moderate and late preterm. Once admitted, clinical features of respiratory episodes requiring hospitalisation are similar among term and preterm infants. Hyaline membrane disease and mechanical ventilation were also risk factors for respiratory admissions.

Keywords:
Moderate preterm
Late preterm
Respiratory viral infections

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