Immunization & Polio Eradication

“Reaching the last child, in the last place.”

Vaccines prevent an estimated 4 million deaths every year, yet in 2024 over 14 million children received no vaccines at all.

Source: WHO (2025), UNICEF (2024)

The Challenge

The children who remain unvaccinated are the hardest to find. They live in settlements that were never mapped, among families always on the move. Reaching them is less a medical problem than a problem of visibility and coordination.

What We Do

Rayn builds the systems that make those children visible. Our geospatial tools have tracked more than 69,000 vaccinators across 42 districts of Pakistan's polio programme, helping teams reach areas that campaigns had been missing. Through GCSS, we supported the effort to reach over 18.9 million children, work recognized by the Gates Foundation, the CDC, and Rotary International. We bring the same approach to routine immunization and measles campaigns, turning field data into the decisions that close immunity gaps round after round.