Table 4.

Number of coughing episodes (≥7 days) in relation to CMI status

CMI statusaB. pertussis antigenNo. of subjects testedMean no. (range) of coughing episodes/person/yrb
ConvertersPT130.6 (0–4)
PRN150.7 (0–4)
FHA90.6 (1–4)
Nonconverters
PT150.5 (0–5)
PRN80.6 (0–5)
FHA130.7 (0–5)
  • a At 48 months of age; all negative at 7 months of age.

  • b Lasting ≥7 days.