QR 1-502        Microbiology
QR 1-74.5                   General
QR 75-99.5                 Bacteria
QR 99.6-99.8              Cyanobacteria
QR 100-130                 Microbial Ecology
QR 171                        Microorganisms in the animal body
QR 180-189.5             Immunology
QR 355-502                Virology