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. 2012 Feb 21;6(3):e48–e53. doi: 10.1111/j.1750-2659.2012.00339.x

Table 1.

 Microneutralization (MN) and hemagglutination inhibition (HI) geometric mean titers (GMT) of selected pH1N1 index cases* and of the close contacts* of six index cases

Index cases (n = 10) Seropositive contacts with symptoms (n = 12) Seropositive contacts withsubclinical infection (n = 11)
MN GMT (95% CI) 707 (414, 1209) 375 (178, 788) 241 (144, 404)
HI GMT (95% CI) 221 (111, 326) 118 (64, 154) 83 (51, 135)
Time from onset of illness to convalescent serum, median days (IQR) 25 (22–31) 36 (19–39) 23 (22–35)
Age, median years (IQR) 23 (7, 39) 16 (11, 24) 38 (29, 44)
Reported fever, No. (%) 9 (100)** 10 (83)   0

CI, confidence interval; IQR, interquartile range.

*Index cases with a convalescent specimen >14 days after symptom onset, including those with well‐timed paired sera. Contacts with blood draw >14 days after symptom onset or after onset of index patient symptoms.

**Information missing on one index case.