Health officials in South Sudan will launch a new four-day vaccination campaign on October 27, after a new outbreak of polio in the country, caused by a mutated, vaccine-derived form of the virus, infected some 15 people.

Despite declaring victory over the wild form of the infectious and contagious virus, which attacks the spinal cord and causes irreversible paralysis in children, Africa’s youngest country has confirmed 15 new cases of vaccine-derived polio in recent weeks.

Low immunization rates and poor sanitation provide the perfect conditions for the deadly pathogen to spread through contaminated water and food. (RT)