Microbiologists study the biochemical, physiological, and genetic aspects of micro-organisms, and how they interact. In general, they:
- Help develop hazard assessments of planned work with micro-organisms to protect staff from exposure and the environment from accidental release
- Work in or create aseptic conditions
- Study human, animal or plant diseases caused by micro-organisms
- Conduct experiments to isolate and grow cultures of micro-organisms under controlled conditions
- Transfer micro-organisms from one culture medium to another without contaminating samples
- Isolate, analyze, and genetically manipulate nucleic acids, proteins, and other substances produced by micro-organisms
- Perform tests on water, food and the environment to detect harmful micro-organisms and to control sources of pollution and contamination
- Perform tests on clinical samples to detect and characterize pathogens
- Observe, identify and classify micro-organisms
- Isolate and genetically modify micro-organisms involved in breaking down pollutants
- Develop genetically modified microbes for use in the production of genetically engineered biological products (proteins) or for gene transfer
Microbiologists use a range of specialized equipment. Depending on the task, they could be working with incubator-shakers, fermenters, autoclaves, light and electron microscopes, epifluorescence or confocal microscopes. Other applications may call for centrifuges, gas chromatographs, high-pressure liquid chromatographs, mass spectrometry, electrophoresis units, thermocyclers, DNA sequencers, fluorescence-activated cell sorters, or phosphorimagers.
Fields of study are likewise wide ranging. They can include:
- Bacteriology in general or a particular aspect of bacteriology, such as public health bacteriology, pharmaceutical bacteriology, hospital or clinical bacteriology
- Environmental microbiology, including pollutant bioremediation
- Food microbiology
- Biotechnology (for more information, see the Biotechnologist occupational profile)
- Immunology (immune reactions in humans or animals)
- Medical or clinical microbiology
- Microbial ecology (for related information, see the Ecologist occupational profile)
- Molecular microbiology (how bacteria or viruses function at the molecular level)
- Eukaryotic microbiology (fungi, parasites or protozoa)
- Virology
Medical microbiologists help scientists and physicians diagnose, prevent, and treat infections in animals and humans by investigating:
- How organisms cause disease and their role in disease processes
- Factors contributing to the occurrence of disease in a population
- How epidemics can be controlled
- The identity and spread of antibiotic-resistant bacteria
Microbiologists in the food, dairy and brewing industries may be involved in quality control. There, they propose sound laboratory and manufacturing practices.
Work in microbiology is often interdisciplinary. Microbiologists may work closely with chemists, biochemists, geneticists, pathologists, physicians, environmental scientists, engineers, veterinarians, or geologists.