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Light microscopy of selected viral diseases (morphology of viral inclusion bodies)
Abstract:
A significant number of viruses produce intracellular changes, inclusion bodies, which do have specific and consistent features important to their identification. The inclusions must fulfill the designated criteria for the specific virus or a member of that group. The specific features of viral inclusions are consistent fixative-dependent artifacts: uniformity and familiarity of staining quality are important to the consistency of recognition and identification. Bouin's or Zenker's-acetic acid are the fixatives of choice, and a well-done hematoxylin and eosin stain offers the greatest uniformity of quality. Viral inclusions are not static objects in a cell and recognition of the range of development is often more important than the appearance of a single inclusion. Generally, most viruses within a group cause identical intracellular reactions and produce similar inclusion bodies, thus permitting the pathologist an accurate prediction of the etiologic agent in clinically undiagnosed or unsuspected viral disease. By correlating viral inclusion identification, clinical history, and physical findings the anatomic pathologist can make the diagnosis of many viral diseases rapidly, inexpensively, and with a high degree of accuracy when compared to the complex, expensive, and time consuming procedures of animal inoculation, tissue culture, or serology.
Insights
Viral inclusion bodies, microscopic changes within cells, offer a rapid and accurate method for identifying viruses. Pathologists can diagnose viral diseases by examining these consistent cellular alterations.
Area of Science:
- Pathology
- Virology
- Cellular Biology
Context:
- Viruses induce characteristic intracellular changes known as inclusion bodies.
- These inclusions possess specific, consistent features crucial for viral identification.
- Accurate recognition relies on understanding fixative-dependent artifacts and staining quality.
Purpose:
- To highlight the diagnostic utility of viral inclusion bodies in pathology.
- To emphasize the importance of specific morphological criteria for identification.
- To present viral inclusions as a valuable diagnostic tool.
Summary:
- Viral inclusion bodies exhibit consistent, fixative-dependent features aiding in identification.
- Optimal staining with hematoxylin and eosin after Bouin's or Zenker's-acetic acid fixation enhances recognition.
- Recognizing the developmental range of inclusions is key, as viruses within a group often produce similar bodies.
Impact:
- Enables rapid, inexpensive, and accurate diagnosis of viral diseases by anatomic pathologists.
- Correlating inclusion identification with clinical data aids in diagnosing unsuspected viral infections.
- Offers a more efficient alternative to time-consuming methods like animal inoculation, tissue culture, or serology.