Measles in Italy: Co-circulation of B3 variants during 2014

Fabio Magurano1, Melissa Baggieri1, Licia Bordi2

  • 1Department of Infectious Parasitic and Immune-Mediated Diseases, National Reference Laboratory for Measles and Rubella, National Institute of Health, Rome, Italy.

Insights

Measles virus (MV) elimination targets remain unmet in Europe. Analysis revealed four MV B3 variants circulating in Italy in 2014, highlighting transmission chains needing urgent investigation to prevent outbreaks.

Area of Science:

  • Virology
  • Epidemiology
  • Public Health

Background:

  • Measles virus (MV) elimination targets set by the World Health Organization European Region (WHO/EUR) were not met in 2013, with most countries exceeding one case per million population.
  • The continued circulation of measles indicates a need to understand transmission dynamics to prevent widespread outbreaks and the introduction of new MV variants.

Purpose of the Study:

  • To analyze the molecular epidemiology of measles virus (MV) B3 strains circulating in Italy in 2014.
  • To identify chains of MV transmission, vulnerable populations, and potential routes for MV variant introduction into the European population.

Main Methods:

  • Molecular epidemiology analysis of measles virus (MV) B3 strains.
  • Identification and characterization of co-circulating MV variants.

Main Results:

  • Four distinct measles virus (MV) B3 variants were identified co-circulating in Italy in 2014.
  • One identified strain was linked to a measles outbreak on a cruise ship early in the year.

Conclusions:

  • The findings underscore the ongoing challenge of measles elimination in Europe.
  • Understanding molecular epidemiology is crucial for identifying transmission hotspots and preventing future outbreaks.

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