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Epidemiology of viral respiratory infections according to gestational age (GA). (A) Sixty-seven percent of all viral-induced hospitalizations (n = 630) occurred in children born full-term (>37 weeks), 12% in preterm (32–37 weeks) and 21% in severely premature children (<32 weeks); (B) distribution of viral pathogens according to GA, presented as percentages of each virus (excluding cases of mixed infections; n = 69); RSV = respiratory syncytial virus; HMPV = human metapneumovirus.
