Detecting the emergence of novel, zoonotic viruses pathogenic to humans

Area of Science:

• Virology
• Epidemiology
• Public Health

Background:

• RNA viruses are a major source of novel human pathogens, frequently originating from animal reservoirs (zoonoses).
• Despite advancements in diagnostics, the rate of novel virulent virus discovery has stagnated at 2-3 per year since the 1950s.
• Most emerging viruses are zoonotic, highlighting the importance of host-pathogen interactions at the human-animal interface.

Purpose of the Study:

• To analyze the factors contributing to the low annual rate of novel virus discovery.
• To identify geographic and strategic gaps in current global disease surveillance systems.
• To propose a more effective strategy for uncovering future viral threats.

Main Methods:

• Analysis of historical virus discovery data.
• Evaluation of global disease surveillance infrastructure and geographic coverage.
• Assessment of diagnostic capabilities in different global regions.

Main Results:

• The low number of annually discovered novel viruses is largely an artifact of inadequate surveillance, particularly in tropical and subtropical countries.
• Established endemic pathogens are frequently misdiagnosed in these under-surveilled regions.
• Many future emerging viruses are likely already circulating in human populations but remain undetected.

Conclusions:

• Enhanced disease surveillance in under-resourced tropical and subtropical regions is critical for identifying novel and emerging viruses.
• A targeted surveillance strategy in selected populations can uncover viruses currently circulating undetected.
• Proactive global health security requires improved monitoring of zoonotic spillover events and pathogen emergence.