You can audit the course at no charge. It's aimed at professionals, but I think a well read lay person could benefit from it as well. It covers biofilms and chronic infections of the ear, lung, and bone implants among others.
coursera.org/learn/bacteria...
I took it last year, and have never had more than online introductory classes in biology. But I love science, and fear no Latin or Greek ... or Danes with thick accents, for that matter.