| limited and localized outbreak of newly emergent type 2 vaccine-derived poliovirus in sichuan, china. | from august 2011 to february 2012, an outbreak caused by type 2 circulating vaccine-derived poliovirus (cvdpv) occurred in aba county, sichuan, china. during the outbreak, four type 2 vdpvs (≥0.6% nucleotide divergence in the vp1 region relative to the sabin 2 strain) were isolated from 3 patients with acute flaccid paralysis (afp) and one close contact. in addition, a type 2 pre-vdpv (0.3% to 0.5% divergence from sabin 2) that was genetically related to these type 2 vdpvs was isolated from anot ... | 2014 | 24850620 |
| an outbreak of type π vaccine-derived poliovirus in sichuan province, china: emergence and circulation in an under-immunized population. | during august 2011-february 2012, an outbreak of type π circulating vaccine-derived poliovirus (cvdpvs) occurred in sichuan province, china. | 2014 | 25503964 |
| [epidemiological analysis of poliomyelitis cases in 1994, china]. | in 1994, the number of reported polio cases was 307 in china. this number was 53% lower than that in 1993, and was the lowest record ever in china. in 1994, the distribution of polio cases was highly dispersed and the number of outbreak was reduced obviously. of 225 counties which reported polio cases in 1994, polio outbreak occured in 2 counties. cases due to polio outbreak accounted for 4.2% of the total cases. the distribution of polio wild virus was narrow but the regional difference still e ... | 1995 | 8728953 |