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Canine atopic dermatitis (CAD) is a common chronic pruritic skin disease and a major challenge in veterinary dermatology due to its multifactorial pathogenesis and lifelong management requirements. The condition results from a complex interaction between genetic predisposition, immune dysregulation, epidermal barrier dysfunction, and hypersensitivity to environmental allergens, leading to persistent pruritus, characteristic lesion distribution, and frequent secondary infections. Diagnosis is primarily clinical and based on exclusion of other pruritic disorders.

Antibiotic resistance is a major global health threat, with livestock production playing a key role in its spread. Extensive and often inappropriate antibiotic use in veterinary medicine has accelerated the emergence of resistant bacteria, which threaten animal, human, and environmental health. Resistance develops through bacterial mutations and horizontal gene transfer, allowing bacteria to survive antibiotics and share resistance genes across species. Humans can be exposed via contaminated food, direct contact with animals, or environmental pathways, highlighting the One Health connection.

The United States (U.S.) is currently facing significant challenges related to the detection of highly pathogenic avian influenza (HPAI) H5N1 in dairy cows. 

Of particular concern, human cases linked to animal exposure have been reported. However, no sustained human-to-human transmission has been detected to date, indicating that the virus has not yet acquired the capacity for efficient spread among people.