Table 2.

Immunization record of two laboratory workers vaccinated with OPV and IPV

No.	Year of birth	date of vaccination	Poliovirus Type 1 Strain CHAT	Poliovirus Type 1 Strain Sabin (LSc-2ab)
			ATTCVR-1562 GMT (IU/ml)	WHO-reference virus GMT (IU/ml)
28	1962	IPV: 04/1964, 06/1964, 09/1964 OPV: 10/1964, 12/64, 04/1964, 01/1971, 03/82	35 (4.9)	64 (3.4)
34	1985	Until 1991 OPV vaccination in Russia, OPV: 04/1985, 05/1985, 07/1985, 01/1986, 03/1986, 02/1987, 03/1987, 11/1996 IPV: 02/2002	256 (35.5)	512 (27.5)