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Table 3 Pertussis positive contact case description

From: Hospital-based prospective study of pertussis in infants and close contacts in Tehran, Iran

   Total Asymptomatic Symptomatic at inclusion Symptomatic during study
N = 53 N = 15 (28.3%) N = 36 (67.9%) N = 2 (3.8%)
Age
  median (IQR) 31 (18-36) 31 (24-35) 30.5 (10.5-36) 46.5
  min-max 2-59 12-57 2-59 41-52
Relationship with index
 Mothers n (%) 18 (34.0) 6 (40.0) 12 (33.4) 0 (0)
 Fathers n (%) 17 (32.1) 7 (46.7) 9 (25.0) 1 (50.0)
 Siblings (<10 yoa) n (%) 9 (17.0) 0 (0) 9 (25.0) 0 (0)
 Siblings (≥10 yoa) n (%) 4 (7.6) 1 (6.7) 3 (8.3) 0 (0)
 Gdfathers/Gdmothersb n (%) 3 (5.7) 1 (6.7) 1 (2.8) 1 (50.0)
 Nurses n (%) 2 (3.8) 0 (0) 2 (5.6) 0 (0)
Pertussis diagnosis
 PCR+ only n (%) 36 (67.9) 12 (80.0) 22 (61.1) 2 (100)
 Serology+ only n (%) 9 (17.0) 2 (13.3) 7 (19.4) 0 (0)
 PCR+ and serology+ n (%) 8 (15.1) 1 (6.7) 7 (19.4) 0 (0)
Pertussis vaccination history
 Siblings <10 yo* n 9 0 9 0
  Non-vaccinated n (%) 2 (22.2) - 2 (22.2) -
  Vaccinated n (%) 7 (77.8) - 7 (77.8) -
  >> unknown doses n (%) 3 (42.9) - 3 (42.9) -
  >> 4 doses n (%) 4 (57.1) - 4 (57.1) -
Macrolide treatment before inclusion
 No n (%) 26 (49.1) 8 (53.3) 17 (42.2) 1 (50.0)
 Yes n (%) 17 (32.1) 2 (13.3) 14 (38.9) 1 (50.0)
 Unknown n (%) 10 (18.9) 5 (33.3) 5 (13.9) 0 (0)
  1. ayo years old, bgdfathers/gdmothers grandfathers / grandmothers