# Trace Elements and Viral Infectious Diseases: Dual Roles in Pathogenesis and Immunity

## TL;DR

This paper reviews how trace elements like zinc and selenium influence immune responses and viral infections, showing both protective and harmful effects depending on their balance in the body.

## Contribution

The paper provides a comprehensive review of the dual roles of trace elements in viral pathogenesis and immunity, emphasizing their context-dependent effects.

## Key findings

- Trace elements modulate antioxidant defense and cytokine signaling in viral infections.
- Deficiencies or excesses of trace elements can worsen disease severity and immune responses.
- Balanced trace element supplementation may improve clinical outcomes in viral diseases.

## Abstract

Introduction: Trace elements such as zinc, selenium, iron, copper, and manganese play a vital role in human health—especially in how the immune system responds and how the body handles viral infections. These trace elements have complex and sometimes context-dependent effects: while they can strengthen the body’s defenses, imbalances may promote viral replication and worsen tissue damage. Methods: Relevant articles discussed in this narrative review were identified through searches in major databases, including PubMed, Scopus, and Web of Science, primarily those published from 2020 onwards. Discussion: In this review, we examine key findings on how trace elements influence antioxidant defense, modulate viral replication, and regulate cytokine signaling, considering the context of innate immunity and the pathology of viral diseases. We discuss their impact on major infections such as HIV, viral hepatitis, and coronaviruses, highlighting how deficiencies or excesses of certain minerals can affect disease severity, immune responses, and clinical outcomes. The therapeutic use of trace element supplementation is also examined, emphasizing the importance of maintaining proper balance to avoid harmful effects. Conclusions: These findings contribute to a deeper understanding of the complex relationship between micronutrients and viral infections, which can inform the development of more effective prevention and treatment strategies. This review underscores the need for further clinical and experimental studies to define optimal levels of these elements in different health and disease scenarios.