Table 1 Trend changes in sentinel surveillance data and relative search volume on Google Trends for RSV between 2018 and 2021

Google Trends

2018

1–18

-2.6 (-5.0 – 0.0)

19–35

10.7^a (8.2 – 13.3)

36–42

-12.9^a (-19.9 – -5.4)

43–52

-4 (-9.9 – 2.4)

Sentinel surveillance

2018

9–21

-3.6^a (-6.1 – -1.0)

22–36

16.4^a (14.6 – 18.2)

37–44

-17.8^a (-20.7 – -14.8)

45–52

-0.5 (-5.6 – 4.8)

Google Trends

2019

1–24

-0.2 (-1.9 – 1.6)

25–36

17.0^a (13.1 – 21.0)

37–41

-21.9^a (-31.6 – -10.8)

42–52

-6.3^a (-1.2 – -2.5)

Sentinel surveillance

2019

1–24

-1.4 (-3.1 – 0.4)

25–36

21.6^a (17.8 – 25.6)

37–46

-18.1^a (-21.2 – -14.8)

47–52

2.6 (-11.5 – 18.8)

Google Trends

2020

1–9

5.2 (-0.1 – 10.8)

10–23

-12.8^a (-16.1 – -9.3)

24–45

6.0^a (3.6 – 8.4)

46–53

-8.2 (-16.9 – 1.5)

Sentinel surveillance

2020

1–9

0 (-2.6 – 2.8)

10–23

-23.7^a (-26.9 – -20.4)

24–40

17.1^a (12.8 – 21.6)

41–53

1.7 (-1.1 – 4.5)

Google Trends

2021

1–10

9.6^a (0.9 – 19.0)

11–26

18.2^a (15.9 – 20.5)

27–38

-21.6^a (-24.0 – -19.2)

39–45

-1.9 (-16.5 – -15.3)

Sentinel surveillance

2021

1–14

16.8^a (12.6 – 21.1)

15–17

3.7 (-29.1 – 51.6)

18–27

16.6^a (13.8 – 19.5)

28–44

-16.4 (18.8 – -14.0)