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Table 2 Characteristics of reported influenza incidents and comparisons between the two influenza seasons

From: Effectiveness of annual influenza campaigns and vaccination in reducing influenza burden in nursing homes of Canton Vaud in Switzerland

Incident characteristics

Season 2021-22

Season 2022-23

Both seasons

p-

value1

Total influenza incidents announced, N

23

20

43

-

Total number of influenza cases, N

90

65

155

-

Infected residents, %

7.6

4.8

6.22

< 0.01

Number of cases per incident, median (IQR)

2 (2)

2 (3)

2 (2.5)

0.83

Attack rate, median (IQR)

3.6% (4.2)

2.5% (4.5)

3.2% (4.5)

0.44

Duration of incident in days, median (IQR)

5 (7)

9 (7.3)

7 (7.5)

0.22

Total number of fatalities, N

5

16

21

-

Case fatality (all incidents), %

5.6

24.6

13.5

< 0.01

  1. N: number, %: percentage, IQR: interquartile range
  2. 1 Comparisons between the two influenza seasons
  3. 2 Weighted average of the two study periods
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Antimicrobial Resistance & Infection Control

ISSN: 2047-2994

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