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Table 1 Characteristics of sporadic and epidemic cases of residents with influenza-like illness (ILI) November 2009-March 2010

From: Surveillance of influenza-like illness in Belgian nursing homes

Residents with ILI

Sporadic cases

(4 NHs)

Epidemic cases

NH-1

Epidemic cases

NH-2

Total

(6 NHs)

Number of cases

4

13

30

47

Mean age (years)

82.8

89.9

84.1

85.6

Date of first/last ILI case

3 Nov/3 Dec

2 Nov/15 Feb

15 Nov/16 Feb

2 Nov/16 Feb

Risk factors (comorbidity)

    

No risk factor

1 (25.0%)

2 (15.4%)

6 (20.0%)

9 (19.1%)

Only 1

2 (50.0%)

5 (38.5%)

8 (26.7%)

15 (31.9%)

2 or more

1 (25.0%)

6 (46.2%)

16 (53.3%)

23 (48.9%)

Vaccination status

    

Seasonal flu

4 (100.0%)

12 (92.3%)

29 (96.7%)

45 (95.7%)

A(H1N1)2009

2 (50.0%)

10 (76.9%)

29 (96.7%)

41 (87.2%)

Treatment for ILI

    

Antiviral only

2 (50.0%)

0 (0.0%)

0 (0.0%)

2 (4.3%)

Antibiotic only

1 (25.0%)

9 (69.2%)

25 (83.3%)

35 (74.5%)

Other only (antipyretic, analgesic,...)

1 (25.0%)

3 (23.1%)

5 (16.7%)

9 (19.1%)

No treatment

0 (0.0%)

1(7.7%)

0 (0.0%)

1 (2.1%)

Clinical issue§

    

Deceased*

0 (0.0%)

0 (0.0%)

5 (16.7%)

5 (10.6%)

Hospitalised

0 (0.0%)

1 (7.7%)

19 (63.3%)

20 (42.6%)

Complication

1 (25.0%)

11 (84.6%)

5 (16.7%)

17 (36.2%)

  1. § not mutually exclusive
  2. * 1 death directly attributable to ILI