Direct Immunofluorescent Antibody (DFA)
Rapid detection of Varicella Zoster infections.
A negative test does not rule out infection; a negative result during acute infection can occur if no virus infected basal epithelial cells are present on the slide. The rapid antigen test and the shell vial for Varicella zoster virus are more sensitive than traditional viral culture. It is advisable to send a specimen for viral culture/shell vial in addition to that for the rapid antigen test, in case the slide is not suitable for testing.
- Chicken Pox Antigen
- Chicken Pox Direct Antigen
- Herpes zoster
- Rapid VZV
- Shingles Antigen
- Varicella Direct Antigen
- Viral Antigen: Varicella zoster
- VZV Antigen
- VZV Direct Antigen
- VARICELLA-ZOSTER ANTIGEN-DFA
Special 3-well Teflon slides are available from MLabs. Using a pencil, label the frosted end of the slide with the patient's first and last names as well as a second identifier such as the patient's medical record number. One slide containing epithelial cells scraped from the base and periphery of the lesion is required. Carefully open the vesicle, soak up the fluid with a dacron or rayon swab, place into M4 transport and use for viral culture. Scrape the base and periphery of the lesion with a sharp instrument or vigorously rub with a dry swab. Gently roll the cells onto the slide, rolling each well separately. Allow the slide to air dry and refrigerate.