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Lethal Synergistic Infections by Two Concurrent Respiratory Pathogens.

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Concurrent infections with two pathogens can increase disease severity. This study proposes a new definition for pathogen synergy and examines the conditions required for these synergistic infections, particularly among respiratory viruses.

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Area of Science:

  • Infectious Diseases
  • Immunology
  • Virology
  • Microbiology

Background:

  • Lethal synergistic infections involving concurrent pathogens like HIV and Mycobacterium tuberculosis, or influenza and SARS-CoV-2, are known.
  • The potential for intracellular synergistic interactions between respiratory viruses, or between viruses and fungi, requires further investigation.
  • Existing knowledge highlights synergistic infections in humans and animal models, but the mechanisms for respiratory viral coinfections need deeper exploration.

Purpose of the Study:

  • To examine the intracellular synergistic interaction possibilities between two respiratory viral pathogens.
  • To investigate synergistic interactions between viral and fungal pathogens.
  • To propose a new definition for pathogen synergy and outline the requirements for synergistic concurrent infections.

Main Methods:

  • Literature review and conceptual analysis of existing data on concurrent infections.
  • Definition and elaboration of criteria for pathogen synergy.
  • Analysis of pathogen characteristics (interference, assistance, prevalence, transmissibility) that facilitate synergistic infections.

Main Results:

  • A new definition of pathogen synergy is proposed: 'pathogen synergy is an interaction of two or more pathogens during concurrent infections causing an increased infection severity compared to mono-infections by the individual pathogens.'
  • Key requirements for synergistic concurrent infections include minimal detrimental interference, one pathogen assisting the other, substantial prevalence, and high transmissibility.
  • Air-transmissible respiratory pathogens, especially RNA viruses, are capable of enabling widespread synergistic infections due to their transmissibility and immune-altering capabilities.

Conclusions:

  • Concurrent infections with respiratory pathogens, particularly viruses, can lead to significantly increased disease severity compared to single pathogen infections.
  • Understanding pathogen synergy is crucial for predicting and managing infectious disease outbreaks, especially in healthcare settings and densely populated areas.
  • Further research into the mechanisms of viral-viral and viral-fungal synergistic interactions is warranted to inform public health strategies.