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Table 1 Demographic characteristics, immunization history and laboratory testing results by the types of children (VDPV case, non-polio AFP case and healthy population) in China during 2001–2013

From: Vaccine-derived poliovirus surveillance in China during 2001–2013: the potential challenge for maintaining polio free status

 

VDPVs case

Non-polio AFP case

Healthy population

Sex

Male

11 (73.3)

7 (46.7)

7 (36.8)

Female

4 (26.7)

8 (53.3)

12 (63.2)

Age (Median ± interquartile range)

1.1 ± 1.3

1.4 ± 1.8

3.9 ± 6.6

OPV immunization history

0 dose

7 (46.7)

2 (13.3)

3 (15.8)

1–2 dose

3 (20.0)

1 (6.7)

2 (10.5)

≥3 dose

5 (33.3)

10 (66.7)

4 (21.1)

Unknown

0 (0.0)

2 (13.3)

10 (52.6)

Nucleotide substitution in VP1 region a

≤10

7 (46.7)

12 (80.0)

9 (47.4)

11–15

7 (46.7)

2 (13.3)

7 (36.8)

≥ 16

1 (6.7)

1 (6.7)

3 (15.8)

Serotypes of VDPVs a

Type 1

6 (40.0)

3 (20.0)

11 (57.9)

Type 2

4 (26.7)

10 (66.7)

6 (31.6)

Type 3

3 (20.0)

2 (13.3)

2 (10.5)

Type 2 + 3

2 (13.3)

0 (0.0)

0 (0.0)

  1. aBased on the first isolation virus