Table 1 Results of neutralization test with CHAT and Sabin 1 strains in paired sera of three laboratory workers with low antibody titers post OPV and four weeks later after IPV booster.

5a

1979

OPV:

before

< 8

(< 1,1)

32

(1,7)

5b

10/1979

after

512

(71,2)

3649

(281,1)

01/1980

02/1981

02/1991

6a

1959

OPV:

before

< 8

(< 1,1)

32

(1,7)

6b

vaccination5 xin Russia

after

287

(39,9)

1625

(125,2)

8a

1966

OPV:

before

< 8

(< 1,1)

16

(0,8)

8b

05/1966

after

575

(79,9)

575

(44,3)

07/1966

08/1966

11/1972

01/1973

11/1978

01/1993