Table 5.

Estimates of Vaccine Efficacy and 95% CI by Vaccine Received and by Interval of Follow-up

Cough and
Duration
Vaccine
Received
Interval
1/10/95–31/10/96
(VE % [95% CI])
1/11/96–31/10/97
(VE % [95% CI])
1/11/97–31/10/98
(VE % [95% CI])
Total Stage 3
(VE % [95% CI])
Any cough ≥7 dSB52 (0–76)76 (61–86)76 (66–83)76 (69–81)
CB62 (16–82)78 (63–87)77 (68–83)78 (72–83)
≥14 d spasmodic or
≥21 d any cough
SB62 (16–82)74 (54–86)79 (70–85)78 (71–83)
CB70 (32–86)78 (61–88)80 (71–86)81 (74–85)
≥21 d spasmodic coughSB83 (49–93)87 (65–95)86 (74–93)86 (79–91)
CB81 (46–93)89 (69–96)86 (74–93)86 (79–91)
  • VE indicates vaccine efficacy; SB, DTaP SB; CB, DTaP CB.