With about a third of adults in the U.S. still completely unvaccinated, and cases of COVID-19 on the rise, the U.S. surgeon general is calling for a war against "health misinformation." On Thursday, Dr. Vivek Murthy is releasing the first surgeon general's advisory of his time serving in the Biden administration, describing the "urgent threat" posed by the rise of false information around COVID-19 — one that continues to put "lives at risk" and prolong the pandemic. Murthy says Americans must do their part to fight misinformation. "COVID has really brought into sharp focus the full extent of damage that health misinformation is doing," Murthy told NPR in an exclusive interview ahead of the advisory's release. Surgeon general's advisories are reserved for significant public health challenges that demand immediate attention.