You can read the entire 4th edition (1996) online through the NCBI Bookshelf . It is indexed and searchable by chapter. Physical Copy:
"Medical Microbiology" by Samuel Baron is a widely used textbook that covers the principles of medical microbiology, including the biology of microorganisms, their interactions with the human host, and the diseases they cause. The book is designed for students of medicine, dentistry, and other health sciences.