Skip to main content

Table 1 Characteristics of primary cases and their household contacts.

From: Assessing secondary attack rates among household contacts at the beginning of the influenza A (H1N1) pandemic in Ontario, Canada, April-June 2009: A prospective, observational study

Characteristic

Primary Cases n (%)

Household Contacts n (%)

Secondary Cases n (%)

Sex, Female

47 (54.0)

119 (44.7)

25 (49.0)

Age, median (range)

18 yrs (1-66)

34 yrs (1-81)

16 yrs (1-62)

Under 16 yrs

34 (39.1)

64 (24.1)

25 (49.0)

2008/9 Seasonal Influenza Vaccination

16 (18.4)

73 (27.4)

15 (29.4)

Reported ARI

85 (97.7)

64 (24.1)

51 (100.0)

Reported ILI

74 (85.1)

31 (11.7)

26 (51.0)

Reported Diarrhea or Vomiting*

21 (24.1)

5 (1.9)

5 (9.8)

Hospitalization

1 (1.1)

0 (0.0)

0 (0.0)

Specimen submitted and tested for pH1N1

86 (98.9)

28 (10.5)

17 (33.3)

 

N = 87

N = 266

N = 51

  1. ARI, acute respiratory illness. ILI, influenza-like illness.
  2. * Specific symptoms were not explicitly asked of contacts