The ear is home to a complex community of bacteria and fungi that may help protect against infections. In healthy ear canals, microorganisms such as Cutibacterium acnes, Staphylococcus species and Malassezia fungi can contribute to a balanced microbial environment. This community works alongside protective earwax, which contains natural antimicrobial substances that help prevent harmful microbes from taking over. When this balance is disrupted by factors such as excessive water exposure, injury or antimicrobial use, organisms including Pseudomonas aeruginosa and Staphylococcus aureus may contribute to ear infections. New sequencing technologies are helping scientists better understand these microbial communities. In the future, personalized microbiome-based testing could potentially improve diagnosis and treatment of bacterial and fungal ear diseases.
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