The 3 main reasons why millions of children aren't receiving vaccines

World Immunization Week is a good place to take stock of how far we have come in protecting children around the world from vaccine-preventable diseases.

The number of children vaccinated against childhood diseases has increased from 20% in 1980, to 86% in 2014.

Yet global immunization levels against major childhood diseases have stalled since 2008.

Why? The answer is complex.

Caryl M. Stern, President & CEO of the US Fund for UNICEF, says: "Immunization is one of the main reasons global child mortality has plummeted since 1990, yet tragically an estimated 1.5 million children still die every year from a disease that could have been easily prevented by a vaccine. We know the challenges - poverty, conflict, misinformation, and the difficulty in reaching the most remote and marginalized communities - but we owe it to the world's children to overcome these barriers."

This infographic, produced by the $4, highlights some of the main obstacles that stand in the way of vaccinating children against diseases that kill. And, provides some solutions:

Help safeguard a vulnerable child against deadly diseases: $4 pledge and a vaccine will be provided to a child in your name.