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Microwave fixation of rabies specimens for fluorescent antibody testing
1Medical Virology, Bureau of Laboratories, Texas Department of Health, Austin, USA.
Abstract:
An adaptation of the conventional procedure for fixation of brain impressions prior to rabies testing was developed using a microwave oven to fix slides in less than 1 min. A total of 2394 routine specimens were examined to evaluate the efficacy of microwave fixation of brain impressions as an aid to shortening the turnaround time for reporting. Slides were fixed for 55-60 s in a standard household microwave oven at 50%, power using phosphate buffered saline supplemented with 3% Tween 20 as a fixative medium. They were then stained using the standard rabies immunofluorescent staining procedure with minor modifications. This process potentially could allow results to be reported to submitters within 1.5 h after specimens arrive in the laboratory. Microwave fixation was in complete agreement with conventional acetone fixation for detection of positive rabies specimens.
Insights
Microwave fixation of brain impressions offers a rapid, effective method for rabies testing. This technique significantly shortens laboratory turnaround time without compromising diagnostic accuracy for rabies detection.
Area of Science:
- Veterinary Pathology
- Diagnostic Microbiology
- Public Health Virology
Background:
- Rabies diagnosis relies on timely laboratory testing of brain tissue.
- Conventional fixation methods can be time-consuming, delaying results.
- Rapid reporting is crucial for animal and human health management.
Purpose of the Study:
- To evaluate a microwave-assisted fixation method for brain impressions.
- To assess its efficacy in rabies diagnosis compared to conventional methods.
- To determine its potential for reducing laboratory turnaround time.
Main Methods:
- Brain impression slides were fixed using a microwave oven (55-60 seconds at 50% power) with a phosphate-buffered saline and Tween 20 solution.
- A total of 2394 routine specimens were processed.
- Slides were stained using a modified direct immunofluorescence assay for rabies virus detection.
Main Results:
- Microwave fixation demonstrated complete agreement with conventional acetone fixation for rabies detection.
- The microwave fixation process takes less than one minute per slide.
- This method has the potential to reduce reporting time to 1.5 hours post-specimen arrival.
Conclusions:
- Microwave fixation is a viable and efficient alternative for preparing brain impressions for rabies testing.
- The technique significantly accelerates the diagnostic process for rabies.
- This rapid method aids in faster public health response and animal management decisions.