What Is Microbiology?
Microbiology is the study of microorganisms, including bacteria, fungi, parasites and some other microscopic life forms. In healthcare, microbiology focuses on detecting and identifying microorganisms that may be involved in infection.
A medical microbiology laboratory helps healthcare professionals investigate questions such as: Is there evidence of infection? What organism may be present? Which antimicrobial medicines may work? Is there evidence of resistance?
What does a microbiology laboratory do?
| Laboratory task | What it means |
|---|---|
| Specimen reception | Checking sample type, labelling and suitability |
| Microscopy | Looking for cells, bacteria, fungi or parasites under a microscope |
| Culture | Growing organisms on special media |
| Identification | Working out what organism is present |
| Susceptibility testing | Testing which antimicrobials may work |
| Molecular testing | Detecting genetic material from organisms |
| Result reporting | Releasing results with appropriate interpretation and comments |
| Urgent escalation | Communicating significant findings according to policy |
What samples are used in microbiology?
| Specimen | Example purpose |
|---|---|
| Urine | Investigation of urinary tract infection |
| Wound swab | Investigation of wound infection |
| Blood culture | Investigation of bloodstream infection |
| Sputum | Investigation of respiratory infection |
| Throat swab | Investigation of throat infection |
| Stool | Investigation of gastrointestinal infection |
| Genital swab | Investigation of sexually transmitted or genital infections |
| Cerebrospinal fluid | Investigation of central nervous system infection |
| Tissue or fluid | Investigation of deep or surgical infections |
Culture and sensitivity
Culture means trying to grow microorganisms from a specimen. Sensitivity usually refers to antimicrobial susceptibility testing — helping show which antimicrobial medicines the organism may be susceptible or resistant to. However, microbiology is not only culture. Many laboratories also use molecular tests, antigen tests, serology, microscopy and specialist methods.
Why does microbiology take time?
Microbiology results may take longer than routine blood chemistry results because organisms may need time to grow. Some molecular tests may be faster, but culture remains important for many infections because it can provide organism identification and susceptibility information.
What does a microbiology biomedical scientist do?
A microbiology biomedical scientist may process specimens safely, set up cultures, read culture plates, perform microscopy, use automated identification systems, perform susceptibility testing, review quality control, investigate unexpected results, escalate significant findings, and work with clinical microbiologists or infection teams.
The role requires attention to detail because not every organism grown from a sample is automatically the cause of disease. Contamination, colonisation and clinical significance must be considered carefully.
Microbiology vs virology
| Microbiology | Virology |
|---|---|
| Broad study of microbes | Focuses on viruses |
| Often includes bacteria, fungi and parasites | Focuses on viral DNA/RNA, antigens or antibodies |
| Culture and susceptibility testing are common for bacteria | Molecular testing and serology are common |
| Helps guide antimicrobial decisions | Helps diagnose and monitor viral infections |
Summary
Microbiology is the study of microorganisms. In healthcare laboratories, microbiology helps detect, identify and understand organisms that may be involved in infection. A microbiology biomedical scientist works with specimens, culture, microscopy, identification, susceptibility testing and quality systems to support safe infection diagnosis and patient care.
FAQ
What does microbiology test for?
Medical microbiology commonly tests for microorganisms such as bacteria, fungi and parasites, as well as evidence of infection.
Why do microbiology results take longer?
Some results require organisms to grow in culture before identification and susceptibility testing can be performed.
Is microbiology the same as virology?
No. Virology focuses specifically on viruses, while microbiology is broader.
What is antimicrobial susceptibility testing?
It is testing that helps show which antimicrobial medicines an organism may be susceptible or resistant to.
Can a positive culture always mean infection?
Not always. Some results may reflect contamination or colonisation. Clinical context is essential.
This article is for general education only. Microbiology results must be interpreted by healthcare professionals in clinical context.