22 topics with concise breakdowns: definitions, key facts, and classroom questions.
Clinical microbiology bridges fundamental science and the patient's bedside. This section is dedicated to the study of opportunistic microorganisms and laboratory diagnostic algorithms: from strict adherence to the pre-analytical phase to the accurate evaluation of obtained results.
Here, protocols for the microbiological examination of all key biological materials—blood, cerebrospinal fluid, urine, feces, respiratory tract secretions, wounds, eyes, and ears—are analyzed in detail. A separate, critically important block is devoted to healthcare-associated infections (HAIs), which you will inevitably encounter in clinical practice.
The specific part of the section covers oral microflora: biotopes, dental plaque formation, the role of streptococci, and obligate anaerobes. You will study the microbiological aspects of dental caries, periodontal diseases, and odontogenic infections. In classes and exams, the rules for material collection, criteria for the etiological significance of the isolated microbe, and the pathogenesis of HAIs are questioned most strictly—pay special attention to these topics.
Why does clinical microbiology focus on opportunistic microorganisms (OMs)?
In non-infectious hospitals, opportunistic microorganisms are found significantly more often than obligate pathogens and are the main cause of nosocomial complications.
The bacteriological method is the gold standard of diagnosis in this case, as it allows for the precise determination of the microbe type, its quantity, and its susceptibility to drugs.
The bacteriological method is the gold standard of diagnosis in this case, as it allows for the precise determination of the microbe type, its quantity, and its susceptibility to drugs.
Why must biological material be collected before starting antibiotic therapy?
Antibacterial and antifungal drugs inhibit the growth of the pathogen. If material is collected during therapy, the culture will show no growth, leading to a false-negative result.
Why are multiple nutrient media used simultaneously in cultures?
Because different pathogens can cause diseases with similar clinical presentations, the "battery of media" principle is applied. Using several differential-diagnostic and selective media simultaneously ensures the target pathogen is not missed.
In which cases can the laboratory issue a preliminary result within 18–20 hours?
This is possible if the biological material contains a monoculture of a microorganism with a very high bacterial load. In such situations, the laboratory technician can place antibiotic disks directly onto the primary isolation plate.
Study the full topic in the «Microbiology» course
This is a summary. The course covers everything tested in classes and exams.
4,383 pages of study guides across all topics
Assignments and quizzes after every topic — just like in a colloquium