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Germany Faces Growing Diphtheria Outbreak, RKI Issues Nationwide Alert

126 cases reported by late April, with vulnerable groups increasingly affected and evidence of domestic transmission.

Overview

  • The Robert Koch Institute (RKI) has confirmed 126 diphtheria cases in Germany as of late April 2025, marking a significant increase in infections.
  • The outbreak is driven by the bacterial strain Corynebacterium diphtheriae ST574, with genomic data indicating domestic transmission across regions and populations.
  • Vulnerable groups, including homeless, unvaccinated individuals, and older adults with pre-existing conditions, are increasingly affected alongside refugee communities.
  • Severe and fatal cases of respiratory diphtheria are rising, prompting heightened concern among health authorities.
  • The RKI urges increased testing, contact tracing, and vaccination efforts, emphasizing the importance of booster immunizations to close immunization gaps.