Ear mite of cattle

Raillietia auris is a parasitic mite belonging to the order Mesostigmata, family Raillietiidae. It is a highly specialized endoparasite that resides within the external ear canal of cattle, where it thrives by consuming glandular secretions and epithelial tissue.

The primary hosts of this pest are cattle. While other livestock may be present in a farm environment, Raillietia auris exhibits a strong biological preference for the bovine ear micro-habitat, where it can remain undetected for long periods during the initial stages of infestation.

The life cycle of this mite is entirely completed within the ear canal of the host. The developmental stages include eggs, larvae, protonymphs, deutonymphs, and adults. The mite's biological strategy relies on a stable environment provided by the host's body, which allows for rapid reproduction and colonization of the entire ear passage.

The damage caused by these mites is significant. Infestations lead to severe otitis media and externa. The accumulation of debris, dead mites, and inflammatory discharge results in blocked ear canals, causing intense pain, irritation, constant head shaking, and a noticeable reduction in the weight gain or milk production of the affected animals.

Protective measures are primarily veterinary-focused. Effective control involves:

• Physical examination of cattle ear canals;
• Application of topical acaricides or systemic antiparasitic agents;
• Routine cleaning of ear passages to remove debris;
• Quarantine protocols for new or symptomatic animals to prevent herd transmission.