Table 1.

Results of testing for specific IgM after a booster dose of OPV in subjects seronegative 10 years after completing a poliomyelitis vaccination schedule (8)

Days since boosterNo. of subjects positive for IgM/no. vaccinated
Schedule 1aSchedule 2bTotalc
Polio 1
 150/30/30/6
 300/20/30/5
Polio 2
 151/31/3
 301/31/3
Polio 3
 155/119/2114/32
 304/109/2113/31
  • a Monovalent vaccine doses plus two trivalent vaccine doses (used until 27 February 1972).

  • b Four balanced trivalent vaccine doses (used since 28 February 1972).

  • c Polio 1, 0; polio 2, 1; polio 3, 16.