Epidemiology and Sequence-Based Evolutionary Analysis of Circulating Non-Polio Enteroviruses

Area of Science:

• Virology
• Genomics
• Public Health

Background:

• Enteroviruses (EVs) are positive-sense RNA viruses with diverse clinical manifestations, ranging from mild respiratory symptoms to severe neurological diseases like acute flaccid paralysis (AFP).
• Specific enterovirus types, including endemic EV-B species and pandemic strains like EV-A71 and EV-D68, are linked to significant outbreaks and severe human disease.
• The public databases contain over 50,000 EV nucleotide sequences, providing a rich resource for studying viral diversity and evolution.

Purpose of the Study:

• To review and analyze the prevalence, characteristics, and circulation dynamics of different enterovirus types.
• To assess the sequence coverage of various EV types in public databases and identify gaps.
• To investigate the genetic relatedness and diversification mechanisms within the Enterovirus genus, particularly the EV-A species.

Main Methods:

• Literature review of recent studies on EV prevalence, characteristics, and circulation.
• Analysis of sequence data from public databases, such as the Virus Pathogen Resource (VPR).
• Phylogenetic analysis to determine the evolutionary relationships between different EV types.
• Recombination analysis within the EV-A species to identify genomic diversification events.

Main Results:

• Significant temporal and geographic variations in EV circulation patterns were observed.
• Analysis revealed disparities in sequence coverage across different EV types in public databases, highlighting areas needing more data.
• Phylogenetic analysis elucidated the relatedness of various EV types.
• Evidence of recombination was found within the EV-A species, indicating its role in genomic diversification.

Conclusions:

• Enteroviruses remain significant public health threats due to their diverse clinical impact and the lack of broadly protective vaccines and effective antivirals.
• Understanding EV diversity, circulation, and genomic evolution is crucial for disease surveillance and control.
• Gaps in sequence coverage in public databases need to be addressed to improve our understanding of EV epidemiology and evolution.