Health workers have begun a campaign to vaccinate 9.5 million children against polio in 41 districts in Pakistan this week. This latest round of a national vaccination drive will include Islamabad and focus particularly on areas where polio-positive sewage samples have been found.

The anti-polio drive will be launched in 16 districts of Balochistan, 11 districts of Khyber Pakhtunkhwa, eight districts of Sindh, and five districts of Punjab, according to local media.

Despite major efforts to eradicate the disease in Pakistan, six cases of the highly infectious virus have already been reported this year. Further hampering the drive, vaccination teams and medical professionals have faced harassment and even physical attacks in some parts of Pakistan.

Pakistan’s PM Shehbaz Sharif, however, said the government “remains steadfast” in its aim to eradicate polio after a meeting with American billionaire philanthropist Bill Gates in Islamabad last week.