Table 1 The number of influenza and other respiratory viruses detected and their reduction in 2020 before, during and after the lockdown compared with the reference period of 2015–2019.
Virus | Pre-lockdown | Lockdown | Post-lockdown | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Level 4 | Level 3 | Level 2 | Level 1 | Level 2&3 | Level 2&1 | Subtotal | |||||
Month | Jan | Feb | 1–24 Mar | Subtotal | 25 Mar–27 Apr | 28 Apr–12 May | 13 May–7 Jun | 8 Jun–11 Aug | 12 Aug–29 Aug | 31 Aug–27 Sept | |
No. of weeks | 1–5 | 6–9 | 10–12 | 13–17 | 18–19 | 20–23 | 24–32 | 33–35 | 36–39 | ||
Influenza | |||||||||||
No. (2020) | 196 | 156 | 122 | 474 | 20 | 0 | 1 | 5 | 0 | 0 | 6 |
Median (2015–2019) | 84 | 55 | 62 | 206 | 62 | 27 | 126 | 2618 | 731 | 544 | 5062 |
IQR (2015–2019) | 39–85 | 30–94 | 21–66 | 90–240 | 51–139 | 20–79 | 89–318 | 1120–3165 | 549–996 | 513–935 | 3131–5097 |
%Reductiona | −133.3 | −183.6 | −96.8 | −130.1 | 67.7 | 100.0 | 99.2 | 99.8 | 100.0 | 100.0 | 99.9 |
RSV | |||||||||||
No. (2020) | 9 | 16 | 9 | 34 | 16 | 3 | 8 | 15 | 5 | 3 | 34 |
Median (2015–2019) | 14 | 15 | 15 | 44 | 85 | 46 | 162 | 1176 | 270 | 159 | 1743 |
IQR (2015–2019) | 14–15 | 11–16 | 15–20 | 40–45 | 43–93 | 40–57 | 159–167 | 1056–1219 | 253–361 | 146–287 | 1591–2103 |
%Reductiona | 35.7 | −6.7 | 40.0 | 22.7 | 81.2 | 93.5 | 95.1 | 98.7 | 98.1 | 98.1 | 98.0 |
Rhinovirus | |||||||||||
No. (2020) | 103 | 177 | 238 | 518 | 26 | 2 | 10 | 175 | 95 | 44 | 326 |
Median (2015–2019) | 72 | 79 | 90 | 232 | 144 | 79 | 209 | 529 | 175 | 305 | 1282 |
IQR (2015–2019) | 67–85 | 76–87 | 77–111 | 220–303 | 135–193 | 62–94 | 206–227 | 498–538 | 172–216 | 244–336 | 1277–1384 |
%Reductiona | −43.1 | −124.1 | −164.4 | −123.3 | 81.9 | 97.5 | 95.2 | 66.9 | 45.7 | 85.6 | 74.6 |
Enterovirus | |||||||||||
No. (2020) | 34 | 30 | 23 | 87 | 3 | 0 | 5 | 33 | 9 | 14 | 61 |
Median (2015–2019) | 40.5 | 34 | 34 | 107.5 | 69 | 26.5 | 44 | 110.5 | 53.5 | 84 | 343 |
IQR (2015–2019) | 34–48 | 29–45 | 25–54 | 102–133 | 58–81 | 20–35 | 42–51 | 88–140 | 41–56 | 67–107 | 262–383 |
%Reductiona | 16.0 | 11.8 | 32.4 | 19.1 | 95.7 | 100.0 | 88.6 | 70.1 | 83.2 | 83.3 | 82.2 |
Adenovirus | |||||||||||
No. (2020) | 54 | 54 | 37 | 145 | 9 | 3 | 12 | 39 | 25 | 24 | 103 |
Median (2015–2019) | 83 | 59.5 | 66.5 | 207 | 75 | 46.5 | 79 | 227.5 | 84.5 | 129 | 554 |
IQR (2015–2019) | 45–151 | 53–77 | 54–76 | 156–299 | 73–100 | 41–55 | 70–105 | 207–290 | 75–131 | 89–237 | 519–780 |
%Reductiona | 34.9 | 9.2 | 44.4 | 30.0 | 88.0 | 93.5 | 84.8 | 82.9 | 70.4 | 81.4 | 81.4 |
hMPV | |||||||||||
No. (2020) | 11 | 26 | 45 | 82 | 10 | 3 | 10 | 17 | 7 | 3 | 40 |
Median (2015–2019) | 7 | 4 | 6 | 16 | 10 | 5 | 24 | 187 | 103 | 159 | 513 |
IQR (2015–2019) | 7–10 | 2–5 | 4–10 | 12–21 | 5–13 | 5–8 | 20–26 | 161–207 | 95–109 | 147–178 | 458–538 |
%Reductiona | −57.1 | −550.0 | −650.0 | −412.5 | 0.0 | 40.0 | 58.3 | 90.9 | 93.2 | 98.1 | 92.2 |
PIV | |||||||||||
No. (2020) | 25 | 25 | 22 | 72 | 32 | 9 | 24 | 41 | 18 | 9 | 101 |
Median (2015–2019) | 27 | 9 | 7 | 43 | 28 | 17 | 31 | 230 | 82 | 148 | 508 |
IQR (2015–2019) | 24–28 | 8–12 | 6–8 | 38–45 | 21–37 | 16–19 | 31–55 | 200–317 | 66–148 | 136–231 | 398–803 |
%Reductiona | 7.4 | −177.8 | −214.3 | −67.4 | −14.3 | 47.1 | 22.6 | 82.2 | 78.0 | 93.9 | 80.1 |
