Related Experiment Videos
Initial herpes simplex virus type 1 infection prevents ganglionic superinfection by other strains
Abstract:
The ganglia of rabbits infected with a relatively benign strain of herpesvirus (E-43) and challenged with either of two virulent neurotrophic strains (MP or McKrae) were found to be colonized only by the initial benign infecting strain. Primary infection with the E-43 strain resulted in milder disease when the animals were infected with MP or McKrae strains and also prevented colonization of the ganglion by these strains. Neutralization with anti-glycoprotein C, plaque morphology, cytopathic effects, reconstruction experiments, and restriction endonuclease analysis indicated that the virus recovered from the ganglion was the initial infecting E-43 strain; no traces of the challenging MP and McKrae strains were found. The challenging McKrae strain was shed for several weeks in a few animals, but the virus isolated from the trigeminal ganglia of these animals was the primary infecting E-43 strain. These results suggest that initial infection with a relatively benign strain of herpesvirus may prevent superinfection of the ganglion (but not necessarily the end organ) by highly virulent herpes simplex virus strains and could have significant implications in the consideration of immunization against this disease in humans.
Insights
Primary infection with a benign herpesvirus strain (E-43) prevented colonization by virulent strains in rabbit ganglia. This suggests initial herpes simplex virus infection may offer protection against superinfection, impacting human immunization strategies.
Area of Science:
- Virology
- Immunology
- Neuroscience
Background:
- Herpes simplex virus (HSV) infections can cause significant disease, particularly neuroinvasive forms.
- Understanding the dynamics of primary and secondary HSV infections is crucial for developing effective treatments and preventative measures.
Purpose of the Study:
- To investigate whether a primary infection with a benign herpesvirus strain can prevent superinfection by virulent strains in the nervous system.
- To determine the implications of this phenomenon for potential immunization strategies against HSV.
Main Methods:
- Rabbits were infected with a benign herpesvirus strain (E-43) and subsequently challenged with virulent neurotrophic strains (MP or McKrae).
- Ganglia were analyzed using neutralization assays, plaque morphology, cytopathic effect assays, reconstruction experiments, and restriction endonuclease analysis.
- Viral shedding and colonization of trigeminal ganglia were assessed.
Main Results:
- Ganglia were exclusively colonized by the initial benign E-43 strain, with no evidence of the virulent MP or McKrae strains.
- Primary E-43 infection led to milder disease upon challenge with virulent strains.
- Despite shedding of challenge strains, only the primary E-43 strain was isolated from trigeminal ganglia.
Conclusions:
- Initial infection with a benign herpesvirus strain can confer protection against superinfection of the ganglion by virulent herpes simplex virus strains.
- This protective effect, observed in rabbit ganglia, suggests potential for prophylactic immunization strategies against human HSV infections.