Scientists have developed a new type of mRNA cancer vaccine that wakes up the immune system to fight tumors that usually ignore treatment. Instead of focusing on one specific cancer marker, this vaccine tricks the body into thinking it’s under viral attack. This puts the immune system on high alert, helping it spot and destroy hidden tumor cells more effectively. The vaccine works by boosting type-I interferons, natural proteins that kickstart the immune defense when the body senses viruses. Usi

The third COVID vaccine approved in the U.S. works differently from the first two. Find out how viral vector vaccines work and how they’re different from mRNA vaccines. Do you have a viral question? Share them in the comments below for a chance to have them answered ↓ -- Every Wednesday we'll be exploring some big questions about COVID-19 and vaccines with Exploratorium Senior Scientist Julie Yu. For up-to-date information on COVID and vaccines, visit CDC.gov. | Exploratorium