From Thu 7 Nov 2019:
After the strand was eliminated from Pakistan five years ago, all P2 vaccines should have been collected from hospitals and clinics and not used. However, it appears a P2 vaccine was administered accidentally and a child became a carrier for the disease. Tests on the new cases allegedly show the children are all carrying a vaccine-derived form of the disease .
…However, it is understood that, instead of publicly declaring the renewed outbreak and beginning a public vaccination campaign, a “secret” vaccination campaign will begin on Monday in Rawalpindi and surrounding cities in an attempt at containment.