We should note that it is now six months since the most recent case of polio was confirmed in the fatal outbreak of WPV1 in Xinjiang, the first in the country since 2000. The World Health Organization has removed China from its list of active outbreaks. There were 21 confirmed cases in the outbreak, leaving at least 17 people paralyzed, including eight children. Two cases were fatal. A mass immunization program has been undertaken, with a fifth round of vaccinations being administered this month to all children under 15 in Xinjiang and to everyone under 40 in the five worst hit districts, Hotan in the south, where the outbreak was first reported last August, Kashgar, Aksu, Bazhou and Kezhou. The disease is thought to have arrived from Pakistan, where it is endemic and where there have been 13 confirmed cases so far this year.