There is increasing incidence of vaccine-derived poliovirus (VDPV) in countries thought to be polio free. Here, the authors report detection of VDPV in 2 UK children with primary immunodeficiency. The children did not develop paralysis, but isolated viruses showed intra-host evolution and neurovirulent potential.
- Anika Singanayagam
- Dimitra Klapsa
- Maria Zambon
