Live Viral Vaccine Neurovirulence Screening: Current and Future Models

Area of Science:

• Virology
• Vaccinology
• Neuroscience

Background:

• Live viral vaccines are crucial for infectious disease control.
• Ensuring vaccine attenuation and screening for neurovirulence are critical safety steps.
• Emerging viral diseases frequently exhibit neurological effects, highlighting the need for robust testing.

Purpose of the Study:

• To review the limitations of the current monkey neurovirulence test (MNVT) for live viral vaccines.
• To explore and discuss alternative in vivo and in vitro models for assessing vaccine neurovirulence.
• To identify needs for developing improved, rapid, and accurate neurovirulence testing methods.

Main Methods:

• Literature review of existing neurovirulence testing methods.
• Comparative analysis of the monkey neurovirulence test (MNVT) with alternative models.
• Discussion of the advantages and disadvantages of various in vivo and in vitro approaches.

Main Results:

• The MNVT demonstrates limited translatability to human disease and does not capture diverse viral pathogenic mechanisms.
• Alternative models, including in vivo and in vitro methods, show promising data with high translatability.
• Existing methods require further investigation to meet the demand for rapid and accurate neurovirulence screening.

Conclusions:

• There is a critical need for advanced neurovirulence testing methodologies beyond the current MNVT.
• Alternative models offer potential for more accurate and human-relevant assessment of live viral vaccines.
• Further research and validation are essential to implement superior alternatives for vaccine safety evaluation.