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[Histopathological diagnosis of opportunistic infection]
1Department of Pathology, Fujita Health University School of Medicine, Toyoake 470-1192.
Abstract:
The histopathological diagnosis of infectious diseases has definite and inevitable roles not only in identifying the appropriate treatment for the infected patient but also in protecting society from unnecessary risks of pathogen transmission and from exposure to biohazards. The potential for opportunistic infection has been increasing, in response to the gradual increase of aged and immunocompromised patients. Globalization of the world has promoted importation of non-domestic infectious diseases. This article reviews the following points. These include 1) the modes of defense mechanisms against pathogens (neutrophils vs. T-lymphocytes vs. antibodies), 2) epidemiologic aspects of opportunistic infection, including intrinsic, exogenous and imported routes of infection, 3) histopathological features of bacterial pneumonia, 4) immunohistochemical demonstration of pathogens on routine paraffin sections, using commercially available antibodies or patient sera, 5) opportunistic infection in immunosuppressive states, such as AIDS, hematopoietic stem cell transplantation and other special conditions, and 6) the pathologists' function in the prevention of nosocomial (hospital-acquired) infection with MRSA and tuberculous bacilli. Pathologists must realize the importance of correct and prompt histopathological diagnosis of a wide variety of infectious diseases in both immunocompetent and immunocompromised patients.
Insights
Histopathological diagnosis is crucial for treating infectious diseases and preventing pathogen spread. Pathologists play a key role in identifying infections in all patients, especially the immunocompromised.
Area of Science:
- Pathology
- Infectious Diseases
- Immunology
Background:
- Increasing numbers of aged and immunocompromised individuals are susceptible to opportunistic infections.
- Global travel facilitates the spread of infectious diseases across borders.
- Histopathological diagnosis is vital for patient treatment and public health safety.
Purpose of the Study:
- To review defense mechanisms against pathogens.
- To discuss epidemiologic aspects of opportunistic infections.
- To highlight the role of histopathology in diagnosing and preventing infectious diseases.
Main Methods:
- Review of literature on host defense mechanisms (neutrophils, T-lymphocytes, antibodies).
- Analysis of epidemiologic factors in opportunistic infections (intrinsic, exogenous, imported).
- Examination of histopathological features of bacterial pneumonia and immunohistochemical pathogen detection.
Main Results:
- Opportunistic infections are rising due to demographic shifts and globalization.
- Histopathology and immunohistochemistry are essential for identifying pathogens in tissue samples.
- Specific focus on bacterial pneumonia and infections in immunosuppressed states (e.g., AIDS, stem cell transplant recipients).
Conclusions:
- Prompt and accurate histopathological diagnosis is critical for managing infectious diseases in all patient populations.
- Pathologists are essential in preventing hospital-acquired infections, including those caused by MRSA and tuberculous bacilli.
- Understanding defense mechanisms and infection routes aids in disease control and prevention strategies.