Cover photograph (Copyright © 2011, American Society for Microbiology. All Rights Reserved.): Circumsporozoite protein on the surface of Plasmodium vivax strain VK210 sporozoites isolated from the salivary glands of Anopheles dirus mosquitoes is recognized by sera from rhesus macaques immunized with a circumsporozoite protein-based vaccine formulated in a stable emulsion of glucopyranosyl lipid A. (See related article on p. 3492.)