Medical microbiology is a branch of science that studies microorganisms that cause diseases in humans and plays a role in the diagnosis, treatment, and monitoring of these agents. This field contributes to the determination of appropriate treatment methods by accurately identifying the causative agent of a disease. It also helps in the early diagnosis of infections through laboratory tests.
What is Medical Microbiology?
Medical microbiology is a branch of medical science that studies microorganisms that cause disease in humans and is used in the diagnostic process for these agents. It investigates how microscopic organisms such as bacteria, viruses, fungi, and parasites enter the body, how they multiply, and what diseases they cause. This allows for the accurate identification of the source of infections and the development of an appropriate treatment plan.
The bacteria studied in this area can cause diseases such as pneumonia, urinary tract infections, throat infections, and tuberculosis. Viruses are the main causative agents of infections such as influenza, hepatitis, and COVID-19. Fungi can cause skin, nail, and internal organ infections, especially in individuals with weakened immune systems. Parasites, on the other hand, can cause diseases in various organs, primarily the intestinal system.
Medical microbiology enables the detection of these microorganisms in a laboratory setting. By examining blood, urine, sputum, or swab samples, the causative agent of the disease is identified. This prevents unnecessary drug use and allows for the application of the most appropriate treatment to the patient. In this respect, medical microbiology plays an important role in the accurate diagnosis and management of infectious diseases.
What does Medical Microbiology examine?
Medical microbiology essentially encompasses the laboratory investigation of diseases of microbial origin in the body. It plays a crucial role in determining the cause of fever, suspected infection, prolonged inflammatory conditions, and infectious diseases. The main conditions addressed by this unit are as follows:
- Upper respiratory tract infections: In conditions such as sore throat, tonsillitis, and sinusitis, it is investigated whether the causative agent is bacteria or a virus.
- Lower respiratory tract infections: In pneumonia, bronchitis, and lung infections, the type of microorganism is determined.
- Urinary tract infections: In cases of symptoms such as frequent urination, burning, and pain, the causative agent of the infection is identified through urine culture.
- Bloodstream infections (sepsis): The presence of bacteria or other microorganisms in the blood is investigated by blood culture.
- Gastrointestinal infections: In cases of diarrhea, vomiting, and intestinal infections, the presence of bacteria, viruses, or parasites is investigated.
- Viral infections: Tests are performed to diagnose viral diseases such as influenza, COVID-19, hepatitis, and similar illnesses.
- Fungal infections: Fungal infections occurring in the skin, nails, mouth, and internal organs are evaluated.
- Parasitic infections: The presence of intestinal parasites and some tissue parasites is investigated.
- Sexually transmitted diseases (STDs): Microbiological tests are used to diagnose infections such as HPV, HIV, syphilis, and similar conditions.
- Wound and surgical site infections: Post-operative infections or microbial agents in open wounds are examined.
- Tuberculosis (TB): This involves investigating the bacteria that cause tuberculosis, a disease that can affect various parts of the body, primarily the lungs.
- Hospital-acquired infections: These are infections caused by resistant microorganisms that develop in intensive care units and hospital settings.
What are the sub-units of Medical Microbiology?
Medical microbiology is divided into various sub-disciplines to allow for a more detailed study of different types of microorganisms and the diseases they cause. Its basic sub-disciplines include:
Bacteriology
It studies the structure of bacteria, their reproductive characteristics, and the infections they cause. The causative bacteria of diseases such as pneumonia, urinary tract infections, and tuberculosis are investigated in this field.
Virology
It studies viruses and viral diseases. The diagnosis and monitoring of viral infections such as influenza, COVID-19, hepatitis, and HIV are evaluated within the scope of this unit.
Mycology
This field deals with infections caused by fungi. Diagnosis of skin, nail, oral, and systemic fungal diseases is performed within this area.
Parasitology
This unit studies parasites living in the human body and the diseases they cause. Intestinal parasites and some tissue parasites fall within the scope of this unit's work.
Immunology (Serology)
It evaluates the body's immune response to microorganisms. Antibody and antigen tests help diagnose infections.
Molecular Microbiology
It is a sub-unit that examines the genetic structure of microorganisms and provides rapid diagnosis using advanced technologies such as PCR. It is particularly used in situations requiring early diagnosis and accurate detection.
What are Medical Microbiology Tests?
Medical microbiology tests are laboratory examinations that detect bacteria, viruses, fungi, and parasites that cause infections in the body. The question "What are medical microbiology tests?" is of great importance, especially for accurately determining the source of infection and planning appropriate treatment. These tests are performed using different methods depending on the type of sample taken and the suspected microorganism.
Culture tests (soiling method)
Blood, urine, sputum, throat swabs, or wound samples are inoculated onto special culture media to allow microorganisms to grow. This allows for the direct identification of the causative agent of the infection.
Antibiotic susceptibility test (antibiotic sensitivity test)
It determines which antibiotics the detected bacteria are susceptible or resistant to. This ensures that the treatment is carried out with the correct medication.
Microscopic examination
Samples can be examined under a microscope to quickly assess the presence of bacteria, fungi, or parasites.
PCR (molecular tests)
These are advanced tests that detect the genetic material (DNA/RNA) of microorganisms. They are frequently used, especially in viral infections, due to their speed and high accuracy rate.
Antigen tests
It detects the presence of the microorganism's own structures (antigens). Because it provides rapid results, it is preferred in some infections.
Antibody (serology) tests
It measures the body's immune response to infection. It provides information about past or current infections.
Rapid diagnostic tests
These are practical tests that provide quick results. They are particularly used for influenza, COVID-19, or certain bacterial infections.
Parasite examinations
Stool or blood samples are tested for the presence of parasites and parasite eggs.
Mushroom Culture and Testing
Fungal infections are detected from skin, nail, or tissue samples.
Blood culture
This test is performed to determine the presence of bacteria or other microorganisms circulating in the blood. It is particularly important in serious infections (sepsis).
