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One Health

The health of humans, animals, and ecosystems are closely interlinked. Changes in these relationships can increase the risk of new human and animal diseases developing and spreading. One Health is at the intersection of human health, animal health, and environmental health. The most commonly used definition shared by the US Centers for Disease Control and Prevention and the One Health Commission is: One Health is defined as a collaborative, multisectoral, and transdisciplinary approach—working at the local, regional, national, and global levels—with the goal of achieving optimal health outcomes recognizing the interconnection between people, animals, plants, and their shared environment.

The term One Health first came into usage after the SARS pandemic in 2003 and the spread of avian influenza, H5N1. The COVID-19 (SARS-CoV-2) pandemic has further demonstrated the close connection between humans, animals, and the shared environment. Through the One Health lens, public health initiatives will focus on surveillance and upstream interventions that provide benefits for the health of animal, human and ecosystems.

Source: One Health University of Calgary

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