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Area of Science:

  • Virology
  • Epidemiology
  • Genetics

Background:

  • Molecular surveillance of measles variants is crucial for verifying the absence of endemic circulation.
  • Genotyping, based on the N450 region of the measles genome, has been pivotal since 1998.
  • Over 50,000 sequence submissions to the Measles Nucleotide Surveillance database highlight its utility in tracking transmission.

Purpose of the Study:

  • To review current tools for molecular measles surveillance.
  • To address the challenge of decreasing circulating measles genotypes.
  • To discuss strategies for maintaining effective measles strain surveillance.

Main Methods:

  • Analysis of the 450-nucleotide sequence at the end of the measles virus nucleoprotein coding region (N450).
  • Review of existing molecular surveillance tools and databases.
  • Examination of new tools developed by the Global Measles and Rubella Laboratory Network, including named strains and distinct sequence identifiers.

Main Results:

  • Measles genotyping has been an effective resource for tracing transmission pathways.
  • A decrease in circulating measles genotypes presents a challenge to surveillance.
  • New tools have been developed to analyze diversity within currently circulating genotypes.

Conclusions:

  • Continued molecular surveillance is essential for global measles control.
  • Adapting surveillance tools to address reduced genotype diversity is necessary.
  • Generating additional sequence data, including whole genomes, will enhance future strain surveillance efforts.