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Latent Pathogens and Quasi-Latent Pathogens-The Differences and Similarities
1Retired, United States Patent and Trademark Office, San Jose, California, USA.
Abstract:
Many pathogens have evolved capabilities for maintaining chronic infections by entering one or more stages of latency to avoid immune system detection and attack. Several latent pathogens are capable of periodic reactivations decades after their initial infections. However, other pathogens have not evolved intrinsic capabilities for latency to maintain chronic infections, but several of these pathogens can maintain chronic infections by what herein will be called "quasi-latency" in response to suppressions or nutrient deprivation. When later events reduce such suppressions, the quasi-latent pathogens can achieve "resurgent" infections. These quasi-latent pathogens can quickly achieve resurgent infections, which are severe and frequently lethal. This raises the question of how some pathogens can be suppressed into quasi-latency, and how they can become resurgent. Besides innate and adaptive immune cell actions that kill pathogens or pathogen-infected cells, pathogens can be suppressed by nutritional deprivation. Iron deprivation is frequently effective, since iron is essential for pathogens. For instance, hemolytic protozoan parasite infections can provide heme and iron for the resurgence of quasi-latent, iron-deprived pathogens. This could explain the pathogenesis of two puzzling, sometimes lethal pregnancy disorders, pre-eclampsia and eclampsia, which have caused the deaths of millions of women for centuries.
Insights
Pathogens can enter a dormant state called quasi-latency due to immune suppression or nutrient deprivation. Resurgent infections occur when these suppressed pathogens reactivate, posing severe health risks.
Area of Science:
- Pathogen biology and host-pathogen interactions.
- Immunology and infectious diseases.
- Maternal health and pregnancy disorders.
Background:
- Many pathogens establish chronic infections through latency to evade the immune system.
- Some pathogens, lacking intrinsic latency, enter a "quasi-latency" state under immune suppression or nutrient deprivation.
- Reactivation of quasi-latent pathogens leads to severe, often lethal, "resurgent" infections.
Purpose of the Study:
- To investigate the mechanisms by which pathogens are suppressed into quasi-latency.
- To understand the factors enabling the resurgence of quasi-latent pathogens.
- To explore the potential role of quasi-latency and resurgence in pregnancy disorders like pre-eclampsia and eclampsia.
Main Methods:
- Review of existing literature on pathogen latency and immune evasion strategies.
- Analysis of nutritional deprivation, specifically iron deprivation, as a suppressor of pathogen growth.
- Examination of host-derived factors, such as hemolytic protozoan parasites, in providing nutrients for pathogen resurgence.
Main Results:
- Pathogen suppression can be achieved through nutritional deprivation, particularly iron deprivation.
- Hemolytic protozoan parasites can supply essential iron and heme, facilitating the resurgence of quasi-latent pathogens.
- This mechanism offers a potential explanation for the pathogenesis of pre-eclampsia and eclampsia.
Conclusions:
- Quasi-latency represents an alternative strategy for pathogens to maintain chronic infections.
- Iron availability is a critical factor in pathogen resurgence from quasi-latency.
- The proposed mechanism links pathogen quasi-latency and resurgence to severe maternal health outcomes, including pre-eclampsia and eclampsia.
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