David contracted polio from the live polio vaccine when he was a baby. It was later discovered he had a serious underlying immune disorder, which meant he was susceptible to many infections, including polio.

"Polio surveillance is essential to win the fight against polio."

Honorine Mollard Billard, Polio Eradication Officer at WHO, speaks to the GPEI about critical country support to vaccination campaigns in Lao PDR, why it is important for polio-free countries to maintain high immunity, and the additional health interventions offered to communities during a polio campaign.