Clinics around the world are destroying an old, problematic polio vaccine in favor of a new oral one, in an unprecedented effort that has never before been attempted.

The problem with the old vaccine? It was causing polio. Oops.

The massive global eradication effort takes place within the next few weeks at thousands of sites in 155 different countries, and requires a complete destruction of every single vial of the vaccine for the worldwide plan to work.

"Health workers have been taught to destroy the old vaccine by boiling it, incinerating it, even burying it in the ground," reports NPR.org.