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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