Defense Against Invasion (film) Educational film showing the human body’s ability to counteract germs through vaccination. The human body is compared to a city, and the film shows how the city (or body) would react should it be invaded by germs. The city or body could die if it does not avail itself of the protection that science can provide. Produced under the auspices of the Coordinator of Inter-American Affairs. Delivered on August 11, 1943. Directed by Jack King.