Volume 10, Number 4—April 2004
Pediatric Influenza Prevention and Control
|Event||Household contacts of vaccinated children (n = 728)b||Household contacts of unvaccinated controls (n = 370)b||Vaccine effectiveness, %c||p value|
|No. of respiratory tract infections
||3.03 ± 1.68
||4.27 ± 1.68
|No. of medical visits because of respiratory illness
||2.18 ± 1.37
||3.16 ± 1.77
|Loss of maternal work, days
||3.22 ± 1.86
||4.78 ± 2.34
|Loss of paternal work, days
||0.56 ± 0.46
||0.98 ± 2.24
|Help at home to care for ill children, days||0.57 ± 0.37||3.22 ± 2.24||83||<0.0001|
aModified from S. Esposito et al. (39).
bMean values ± standard deviation.
cVaccine effectiveness: 1 minus attack rate (defined as rate of illness divided by the total population) among household contacts of vaccinated children divided by attack rate among household contacts of controls.
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