TABLE 1.

Selected Characteristics of Enrolled Case Children (n = 184)

Characteristicn (%)*
How diagnosed
    Culture123 (67)
    Polymerase chain reaction assay47 (25)
    Epidemiological linkage14 (8)
Signs/symptoms
    Paroxysms133/139 (96)
    Whoop69/137 (50)
    Posttussive vomiting100/138 (72)
    Apnea52/137 (38)
Cough duration
    ≥14 d168/175 (96)
    No. of days, median (range)40 (2–240)
    10th and 90th quantiles, d15 and 106
Hospitalization10/141 (7)
    No. of days, median (range)75 (21–120)
    Age, mo, median (range)14 (6–50)
    Vaccination status
        0 dose2/10 (20)
        1 or 2 doses3/10 (30)
        3 or 4 doses5/10 (50)
Age
    6–11 mo36 (20)
    12–23 mo56 (30)
    24–35 mo35 (19)
    36–47 mo30 (16)
    48–59 mo27 (15)
  • * Percentage of cases with known data.

  • Number with characteristic/number with data available.