The Atlas was compiled in accordance with the program of the subject "Microbiology, Virology and Immunology" for medical universities. The book, written by a team of leading specialists of MMA named after I.M. Sechenov, is a compact visual guide to microorganisms of medical importance, as well as immunology and allergology. Definitions of diseases, mechanisms of transmission of pathogens, their properties and features of diagnostics are described.