In July 2014, MSF held the first of three rounds of a mass vaccination campaign in Adjumani district of northern Uganda to protect children from deadly respiratory infections. Such infections are among the leading causes of child mortality in settings such as this, where refugee settlements host thousands of families forced to flee conflict in neighbouring South Sudan. Children living in the host communities are also eligible for to be immunized. Children between the ages of six weeks and two years old were given the first of three doses of PCV (pneumococcal conjugate vaccine), a vaccine that protects against pneumonia and other diseases caused by pneumococcus. In addition to protection against pneumonia, children up to five years old also received the pentavalent vaccine which protects against five other diseases.