KABUL, 13 December 2021 - The fourth round of a national polio immunization campaign begins this week (13–16 December 2021), and will be synchronized with Pakistan to improve cross-border polio eradication efforts. The campaign targets 9.9 million children aged 0–59 months across the country and is scheduled to start later this month in some parts of the country, including in the south and east, and in the provinces of Paktia and Ghazni in the south-east, Ghor in the west, and Balkh in the north.