You can download Microbiology an introduction 13th Edition by Gerard J. Tortora, Berdell R. Funke, Christine L. Case, Derek Weber and Warner Bai free in pdf format.
Tortora, Funke, and Case’s Microbiology, An Introduction brings a 21st-century lens to the #1 best-selling text on the market. Known for its exceptionally clear presentation of complex topics, this trusted text provides a careful balance of concepts and applications, pedagogically superior art, and robust animations and media via Mastering™ Microbiology.
With the 13th Edition, new Exploring the Microbiome boxes present updated research on the microbiome and how microbes influence human health. Four new Big Picture spreads cover vaccine-preventable diseases, the “hygiene hypothesis,” vertical transmission, and bioterrorism.