Simon Baker & Caroline Griffiths 
BIOS Instant Notes in Microbiology [PDF ebook] 

BIOS Instant Notes in Microbiology, 4th edition, has been streamlined to concentrate on features that are unique to the microbial world, including viruses, making it a more effective resource for students. Information on pathogenesis will be placed within other sections rather than as a separate section. While retaining the Instant Notes philosophy of only covering core material, the text has been updated throughout and will include metagenomics, next generation sequencing, and more on industrial microbiology.