Measles Outbreak Driven by Nosocomial Transmission, Armenia, February–July 2023

Key Points

• Seventy percent of measles patients were exposed to the virus in healthcare facilities, highlighting a significant nosocomial transmission component.
• Of the 287 cases investigated, 75% were unvaccinated with 130 patients under the age of five, showing the vulnerability of young children.
• The outbreak involved three transmission chains, which collectively accounted for 183 cases, illustrating the scale of the issue during March-July 2023.
• Healthcare worker vaccination is crucial, as it could mitigate further outbreaks and protect vulnerable populations from measles.