1. Main results at a glance
2. Vaccination coverage
3. Evolution of the RSV epidemic wave
Virus circulation is measured by positivity percentage to all samples sent to the microbiology laboratories of the Galician Health Service. This percentage is estimated by dividing all positive samples between all negative samples. Following the Galician Epidemiology Butlletin vol XXIII number 6 a percentage of 3% is consider a threshold for the epidemic wave in season 2023-24.
4. RSV hospitalization
4.1 Immunized with Nirsevimab
a) Cohort of infants born between April and September
For current season 2025-26, it includes catch-up children (born between April 1 and September 21, 2025); for the comparison with previous seasons, data was collected from children born between April 1 and September 30 of the start of season year.
b) Infants under 2 months of age
For the current season, this group is dynamic and will begin with a high proportion of catch-up children; as weeks go by, the percentage of infants immunized at birth will increase, until reaching 100% on 22 November.
c) Infants under 6 months of age
Also for this group, at the beginning of the wave the majority of infants come from the catch-up group.
d) Cohort of infants born between April and March in their 2nd RSV season
For 2025-26 are children born between 1 April 2024 and 31 March 2025. Same criteria was applied to the previous seasons cohort.
e) Cohort of children born between April and March in their 3rd RSV season
For 2025-26 are children born between 1 April 2023 and 31 March 2024. Same criteria was applied to the previous seasons cohort.
f) Infants under 2 years of age
Infants under 2 years at the start of hospitalization.
4.2 Not immunized with Nirsevimab
a) Infants 2 to 5 years old
Infants between 2 and 5 years at the start of hospitalization.
b) Infants 3 to 5 years old
Infants between 3 and 5 years at the start of hospitalization.
c) Adults older than 60 years
Adults older than 60 years at date of admission.
d) Adults older than 80 years
Adults older than 80 years at date of admission.
5. Primary care assistance for acute bronchiolitis in children under 2 years of age
a) Cohort of births between April and September
b) Infants under 2 months of age at the consultation date
c) Infants under 6 months of age at the consultation date
d) Infants under 2 years of age at the consultation date