Global Polio Eradication Initiative (GPEI) SOPs describe how to respond to any type of poliovirus outbreak or event in a timely and effective manner, and specifically, to stop an outbreak within 120 days. This guide is for national governments and public health decision-makers, and their global, regional and country-level partners.. Search Terms: SOP, Guide, response, manual, guide, guideline, global, management, World Health Organization (WHO), Strategic Advisory Group of Experts (SAGE) on immunization, GPEI, standard operating procedures