Direct comparison
Bacteriology vs Microbiology: Key Differences
Bacteriology studies bacteria; microbiology covers all microbes. Compare scope, methods, training, funding, biosafety and careers side by side.
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How do Bacteriology, Microbiology compare side by side?
The table below compares Bacteriology, Microbiology across 12 procurement-relevant dimensions, from definition through when to use which term.
Side-by-side comparison
| Dimension | Bacteriology | Microbiology |
|---|---|---|
| Definition | The scientific study of bacteria: how they grow, divide, exchange genes, cause infection, are classified and are detected in the laboratory. | The scientific study of microorganisms: bacteria, archaea, fungi, protozoa, algae and viruses, and the processes they carry out at a scale too small to see unaided. |
| Relationship | A subfield of microbiology. Bacteriology is the older term; the American Society for Microbiology was founded in 1899 as the Society of American Bacteriologists and took its present name in 1960. | The parent discipline. Its main branches include bacteriology, virology, mycology and parasitology, plus cross-cutting areas such as microbial ecology and medical microbiology. |
| Organisms covered | Bacteria only (archaea are sometimes studied alongside them, since both are prokaryotes). | All microbial life, cellular and, by convention, acellular. Viruses are not fully living by most definitions but are routinely housed within microbiology. |
| Typical questions | How does this bacterium resist an antibiotic? How do cells divide, form biofilms or acquire resistance genes by horizontal transfer? Which species is this isolate? | How do microbial communities (microbiomes) assemble in soil, water or the gut? How do different kinds of microbe interact with each other and with hosts? Which microbial process can be harnessed for fermentation or bioremediation? |
| Core methods | Culture on selective and differential media, Gram staining, biochemical and MALDI-TOF identification, antimicrobial susceptibility testing (MIC by broth microdilution, interpreted against CLSI or EUCAST breakpoints), 16S rRNA and whole-genome sequencing. | All of the bacteriological methods plus fungal and viral techniques, PCR and qPCR, metagenomics, electron microscopy, flow cytometry and bioinformatics, chosen to suit the organism group. |
| Training path | Usually a degree in microbiology or biology followed by specialisation in bacterial physiology, genetics, pathogenesis or clinical bacteriology. Few programmes are titled "bacteriology" any more. | A bachelor’s degree in microbiology, biology or a related life science, then typically a PhD, lab rotations and postdoctoral work for research careers. Clinical and public-health laboratory work often runs through medical laboratory science certification instead of a PhD. |
| Typical work settings | Clinical bacteriology laboratories (isolating and identifying bacteria from patient specimens and testing which antibiotics will work), antimicrobial-resistance surveillance, food-safety labs, academic bacterial genetics and physiology groups. | Universities, hospital and public-health laboratories, government agencies, biotechnology, pharmaceutical, food and agricultural companies, environmental and water-quality labs. |
| Biosafety | Bacterial work is assigned to a biosafety level (BSL-1 to BSL-4) by organism risk, following the CDC/NIH BMBL; many teaching and routine clinical organisms are handled at BSL-1 or BSL-2, while some select agents need higher containment and registration. | The same biosafety-level framework, applied across every organism group. Because microbiology also includes viruses, fungi and parasites, the range of containment practices and regulated agents it must manage is wider. |
| Typical funders (US) | NIH, chiefly the National Institute of Allergy and Infectious Diseases (NIAID) for pathogens and antimicrobial resistance, through mechanisms such as the R01 and the T32 training grant. | NIAID for infectious disease, NIGMS for basic microbial biology, NSF Biological Sciences for non-disease microbial ecology and evolution, USDA NIFA, DOE Office of Science and CDC, plus foundations such as the Gates Foundation and Wellcome for global health. |
| Professional bodies and collections | The American Society for Microbiology publishes much of the field’s bacteriology literature; national type-culture collections (ATCC, DSMZ, NCTC) preserve reference strains. | The American Society for Microbiology is the principal US society, publishing multiple peer-reviewed journals (including the open-access journal mBio) and running the ASM Microbe conference. |
| Job titles | Bacteriologist, clinical bacteriology scientist, bacterial geneticist, antimicrobial-resistance researcher. "Bacteriologist" is used less often in US job listings than "microbiologist." | Microbiologist, medical or clinical microbiologist, food or environmental microbiologist, industrial microbiologist, virologist, mycologist, parasitologist. |
| When to use which term | Use "bacteriology" when the subject is specifically bacteria, for example a bacterial genetics course, a bacteriology laboratory section or a bacterial pathogen study. | Use "microbiology" when more than one microbe group is involved, or for departments, degrees, grant programmes and journals. |
Common questions
Common questions about Bacteriology vs Microbiology
Is bacteriology the same as microbiology?
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No. Bacteriology is one branch of microbiology. Microbiology studies all microorganisms (bacteria, archaea, fungi, protozoa, algae and, by convention, viruses), while bacteriology studies bacteria alone. The two are often used loosely as synonyms in clinical settings because so much routine microbiology is bacterial culture and identification.
What does a bacteriologist do compared with a microbiologist?
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A bacteriologist works specifically with bacteria: isolating and identifying them from specimens or environments, testing antibiotic susceptibility, or studying bacterial genetics, physiology and pathogenesis. A microbiologist may do the same work but the title is broader and can also cover fungi, parasites, viruses and microbial communities. In practice many people titled microbiologist spend most of their time on bacteria.
Which is a broader field to study?
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Microbiology. A microbiology degree typically exposes you to bacteria, viruses, fungi and parasites before you specialise, and bacteriology is usually a course or research focus within it rather than a standalone degree.
Are viruses part of bacteriology or microbiology?
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Viruses are not part of bacteriology, which is limited to bacteria. They are conventionally included in microbiology, although virology is often treated as its own discipline because viruses are acellular and depend on a host cell to replicate. Bacteriophages, which are viruses that infect bacteria, sit at the boundary of both.
Do bacteriology and microbiology use different lab safety rules?
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No separate rulebook exists for each. Both follow the same biosafety-level framework (BSL-1 to BSL-4) described in the CDC/NIH Biosafety in Microbiological and Biomedical Laboratories (BMBL), with the level set by the risk of the organism and procedure. What differs is the mix of organisms: microbiology as a whole handles more kinds of agents.
Who funds bacteriology versus microbiology research?
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Largely the same agencies. In the United States, NIAID is the main NIH funder of bacterial pathogen and antimicrobial-resistance research, NIGMS funds basic microbial biology, and NSF, USDA, DOE and CDC fund microbiology tied to their missions. Funding announcements are usually written around a scientific problem or application, not around the label bacteriology or microbiology, so check the current NIH Guide and agency pages rather than assuming a label.
Which term should I use on a CV, abstract or grant application?
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Use the term that matches your actual scope. If your work is limited to bacteria, say so (for example, "bacterial genetics" or "clinical bacteriology"); if it spans microbial groups or is addressed to a department, journal or review panel, "microbiology" is the conventional umbrella term.
