Molecular Epidemiology of Wild Poliovirus Type 1 and Shift in the Historically Reservoir Areas of Pakistan During 2019-2022.

Background: Pakistan is one of the two countries endemic for wild poliovirus type 1 (WPV1). Active clinical and environmental wastewater surveillance along with laboratory investigation is an integral and primary component of the polio eradication strategies. The current study is mainly focused on the virological data to understand the current epidemiology of WPV1 in Pakistan during 2019-2022.