A rabbit model of focal herpes simplex encephalitis

Area of Science:

• Neurology
• Virology
• Infectious Diseases

Background:

• Herpes simplex virus (HSV) is a common cause of sporadic fatal infections of the central nervous system in humans.
• Focal encephalitis is a severe neurological condition that can result from HSV infection.

Purpose of the Study:

• To develop and characterize a rabbit model of focal encephalitis caused by herpes simplex virus (HSV).
• To investigate the temporal and spatial distribution of HSV infection in the rabbit brain.

Main Methods:

• Anesthetized rabbits were inoculated in the olfactory bulb with wild-type HSV.
• Virus cultures, histological examinations, and immunohistochemistry were performed on necropsy specimens.

Main Results:

• Lethal infection occurred in 69% of rabbits, irrespective of HSV dose.
• HSV was cultured from temporal cortex and frontal lobes in 76% of infected animals within 10 days post-inoculation.
• Histology revealed severe temporal cortex involvement in 80% of brains examined three or more days post-inoculation; viral antigens persisted up to three weeks.

Conclusions:

• This study successfully established a rabbit model for focal HSV encephalitis.
• The model demonstrates significant temporal cortex tropism and persistent viral antigen presence, valuable for future research.