TABLE 3.

Efficacy of DTP vaccines in six trials conducted in four countries from 1990 to 1995

Study location (reference)Vaccine manufacturer% Efficacy againsta:
Mild and typical pertussisTypical pertussis
Senegal (708)Pasteur Mérieux Sérums et Vaccins92 (86-99)
Sweden (310)Connaught USA41 (30-51)48 (37-58)
Italy (293)Connaught USA23 (1-40)36 (14-52)
Germany (719)Lederle83 (76-88)93 (89-96)
Germany (697)Behringwerke AG or SmithKline Beecham Biologicals81 (68-89)89 (77-95)
Germany (464)Behringwerke AG96 (71-100)
  • a 95% CI is given in parentheses.