More than 300 children died from measles in Pakistan in 2012, according to the World Health Organisation, a five- time increase from the year before.
Most of the deaths were in Sindh province, where the disease killed 210 children. At least 100 of those deaths were in December alone.
The UN organisation says the virus is most dangerous for children between the ages of nine months and 12 years.
Al Jazeera's Osama Bin Javaid reports from the city of Larkana, one of the worst affected areas in Sindh.