Immune Privilege Furnishes a Niche for Latent Infection.

Area of Science:

• Neuroscience
• Immunology
• Ophthalmology

Background:

• The central nervous system (CNS) microenvironment, encompassing the eye and brain, is vulnerable to pathogen invasion.
• Pathogen invasion of the CNS often leads to severe tissue destruction and inflammation.

Purpose of the Study:

• To review how immune privilege (IP) in the CNS facilitates latent infections.
• To explore the CNS as a reservoir for persistent pathogens that can reactivate.

Main Methods:

• Literature review of studies on CNS infections and immune privilege.
• Analysis of pathogen evasion strategies within the CNS.
• Examination of the role of immune deficiency in pathogen reactivation.

Main Results:

• Intraocular inflammation (IOI) initially appearing non-infectious can be caused by reactivated latent pathogens.
• The CNS, particularly the eye and brain, serves as a reservoir for undetected, lifelong latent infections.
• Different pathogens employ distinct strategies to evade immune detection within the CNS.

Conclusions:

• Immune privilege in the CNS permits latent infections, creating reservoirs for pathogens.
• Reactivation of these latent CNS infections, especially during immune deficiency, can cause sight- and life-threatening inflammation.