Table 1

Population at risk of respiratory syncytial virus infection (infants <2 years of age) and hospitalisation before and after AIFA-2016 limitations

Before AIFA-2016 limitations
RSV seasons 2014–2016
After AIFA-2016 limitations
RSV season 2017
Total
Population at risk at the start of the RSV season
 Children<24 months193 38691 516284 902
 Children<6 months47 60822 71570 323
  Premature baby (<37 weeks of gestation)40698.5%18268.0%58958.4%
   Gestational age at birth*
   >35 and <3717143.6%7573.3%24713.5%
   >32 and ≤3517143.6%7653.4%24793.5%
   >29 and ≤324440.9%1910.8%6350.9%
   ≤291970.4%1130.5%3100.4%
Hospitalisations
 All causes28 54912 61441 163
 Respiratory virus350816205128
 RSV12285011729
  Age (months)*
   024219.7%10821.6%35020.2%
   133927.6%12625.1%46526.9%
   222017.9%9018.0%31017.9%
   31169.4%5310.6%1699.8%
   4635.1%397.8%1025.9%
   5514.2%204.0%714.1%
   6403.3%122.4%523.0%
   >615712.8%5310.6%21012.1%
  • *P>0.05, 0.1807 and 0.2951, respectively (χ2 test).

  • AIFA, Italian Medicines Agency; RSV, respiratory syncytial virus.