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This study found that swine are significantly less susceptible to enteroviruses than tissue cultures, even with minimal waterborne viral exposure. This research highlights a robust animal model for studying viral infections and water safety.

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Area of Science:

  • Virology
  • Environmental Health
  • Animal Models

Background:

  • Enteroviruses are a significant public health concern, often transmitted through contaminated water.
  • Understanding minimal infectious doses is crucial for setting water quality standards.
  • Existing models for studying enterovirus infections have limitations in reproducibility and safety.

Purpose of the Study:

  • To investigate infections caused by minimal quantities of waterborne enteroviruses.
  • To evaluate the susceptibility of a swine model to enteroviruses compared to tissue cultures.
  • To assess the efficacy of chlorination in reducing viral infectivity.

Main Methods:

  • Young weanling swine were orally administered known quantities of enteroviruses in drinking water.
  • Viral infectivity was compared between the swine model and tissue cultures.
  • The impact of feeding status and dose frequency on infection was examined.
  • A single trial assessed the effect of chlorination on viral infectivity.

Main Results:

  • The swine model was significantly less susceptible to enterovirus infection than tissue cultures (1000-fold less likely).
  • No infected animals exhibited illness, despite the use of virulent viral strains.
  • Chlorination significantly reduced viral infectivity but did not achieve complete elimination in one trial.
  • Newborn swine were not infected by a dose of 20 plaque-forming units (pfu) via gavage.

Conclusions:

  • Young swine serve as a reproducible and safe model for studying waterborne enterovirus infections.
  • The swine digestive tract and its enteroviruses share similarities with human counterparts.
  • Minimal viral doses may not always lead to overt illness in susceptible hosts.
  • Further research is needed to optimize water disinfection strategies against enteroviruses.