TABLE 4

Subanalysis of Children Infected With Pandemic H1N1 Strains, and Non-H1N1 Strains of Influenza A

H1N1, n (%), n = 29Non-H1N1, n (%), n = 20P Value
Age, mo, median75.153.8.25
Boys15 (51.7)15 (75.0).10
Race
 White12 (41.4)5 (25.0)
 Black15 (51.7)14 (70.0).26
 Other2 (6.9)1 (5.0)
No. in household, mean ± SD4.95 ± 1.964.41 ± 1.54.30
Day care/school attendance16 (55.1)7 (35.0).13
Any high-risk conditiona22 (75.9)10 (50.0).06
 Asthma9 (31.0)4 (20.0).39
 Neurologic condition5 (17.2)3 (15.0).84
 Chronic respiratory disease0 (0)0 (0)
 Heart disease2 (6.9)2 (10.0)1.0
 Sickle cell/asplenia5 (17.2)2 (10.0).69
Sick contacts15 (51.7)11 (55.0).82
Smokers in household6 (21.4)9 (45.0).08
FLU vaccine14 (48.2)8 (40.0).91
Any severe complicationb13 (44.8)5 (25.0).16
 Pneumonia11 (37.9)1 (5.0)<.01*
 Respiratory failure0 (0.0)3 (15.0).03*
 Seizure1 (3.4)0 (0.0).40
 Bacteremia1 (3.4)0 (0.0).40
 Bacterial tracheitis1 (3.4)0 (0.0).40
 Encephalopathy0 (0.0)1 (5.0).22
 Death0 (0.0)0 (0.0)
  • *, statistically significant; —, not applicable.

  • a Subjects may have had >1 high-risk condition.

  • b Subjects may have developed >1 severe complication.