AIDS

A new ``First Book,'' graced with large print, well-explicated color photos, and comprehensible scientific explanations. With clarity and accuracy—no simple task—Greenberg explains the causes, transmission, diagnosis, and lines of defense against the virus. Along the way, he includes interesting facts (e.g., viruses are so small that they're measured in nanometers—billionths of a meter), plus information on current research toward arrest and cure that gives a hopeful tone. There's an especially nice photo of a healthy child in a day-care center playing with and touching an HIV-infected infant. Glossary; bibliography; resources; index. (Nonfiction. 10-14)