Pakistan responsible for most polio cases: WHO

The World Health Organisation (WHO) has held Pakistan responsible for nearly 80 percent of polio cases reported globally.

"The situation is primarily due to a lack of access to children for vaccination, largely owing to a continuing ban on immunisation imposed by militants in the North and South Waziristan, and insecurity and killing of polio workers in the field," said a progress report released Thursday.

"Issues involving children's access to immunisation and safety of vaccinators must be resolved to ensure that the programme can be completed," said the report, Dawn online reported.