Protective and stochastic correlation between infectious diseases and autoimmune disorders

Area of Science:

• Immunology
• Microbiology
• Public Health

Background:

• Early exposure to microbes like bacteria, viruses, and parasites may regulate the immune system and reduce autoimmune disease risk.
• Improved hygiene has decreased microbial exposure, potentially contributing to increased autoimmune disease incidence.
• Molecular mimicry is a mechanism where microbial components trigger immune responses against self-molecules, leading to autoimmune diseases.

Purpose of the Study:

• To review the complex relationship between microbial exposure, hygiene, and autoimmune diseases.
• To explore how the innate immune system's evolution influences protection and autoimmunity.
• To analyze the dual impact of hygiene on microbial-associated and non-microbial autoimmune conditions.

Main Methods:

• Literature review and synthesis of existing research on immunology, microbiology, and public health.
• Analysis of evolutionary aspects of the innate immune system in response to microbial patterns.
• Examination of epidemiological and mechanistic links between hygiene, microbial exposure, and autoimmune diseases.

Main Results:

• Early and diverse microbial exposure can fortify immune regulation, potentially preventing autoimmune conditions.
• Reduced microbial exposure from enhanced hygiene may increase susceptibility to certain autoimmune diseases.
• Molecular mimicry by microbes is a key trigger for autoimmune diseases, but hygiene can mitigate this.
• Hygiene protects against microbial-related autoimmunity but may increase risks for non-microbial autoimmune pathologies.

Conclusions:

• The immune system's interaction with microbes is a double-edged sword in autoimmunity.
• Hygiene practices present a complex trade-off, offering protection against some autoimmune diseases while potentially increasing risk for others.
• Further research is needed to fully elucidate the intricate balance between microbial exposure, hygiene, and autoimmune disease development.