This is a wonderfully comprehensive overview of biofilms, one of the best primers publicly available.
Click on this link to access the PDF. It’s appr. 3.5 MB if you care to save it on your computer.
Biofilms 101
Biofilms Made Easy: A Picture Tutorial”
Understanding the Impact of Microbiology, Focusing on Biofilms.
John G. Thomas, PhD, Sara B. Posey, MPH, and Staff.
WVU School of Medicine
Department of Pathology
Biofilm Research Laboratory for Translational Studies