Disease

Somalia Polio Outbreak Spreads

Somalia is suffering an ‘‘explosive’’ outbreak of polio and now has more cases than the rest of the world combined, an official said Friday.

Vaccine-wielding health workers face a daunting challenge: accessing areas of Somalia controlled by al-Qaida-linked militants, where 7 of 10 children aren’t fully immunized.

Polio is mostly considered eliminated globally except mainly in three countries where it is considered endemic: Afghanistan, Nigeria and Pakistan. India marked a major success in February 2012 by being removed from the World Health Organization’s list of countries plagued by the disease.

Somalia now has 105 cases, figures released Friday show, and another 10 cases have been confirmed across the border in a Kenyan refugee camp filled with Somalis. Globally there have been 181 cases of polio this year, including those in Somalia and Kenya.