Using lessons from the smallpox eradication campaign, Sabin Executive Vice President Dr. Ciro de Quadros makes the case for increased contributions for immunization--in the run-up to the GAVI Alliance's pledging conference next week in London--which could save an estimated 4 million lives.

In a blog post for the ABC News "Be the Change" initiative, Dr. de Quadros asks those attending the meeting "to consider what this world may have been like, had world leaders not answered the call 40 years ago to eliminate smallpox."

Read "A Lesson from Smallpox Eradication."