People migrate for many reasons. These reasons can be classified as economic, social, political or environmental: economic migration - moving to find a job or following a certain career path.
Migration can expose hosts to a greater number of infectious diseases, as it covers a larger area and visits more habitats than residents. However, because long-distance movement is energy consuming, migration can have a devastating effect on infected hosts, reducing the risk of infection.
Greater human mobility, largely driven by air travel, is leading to an increase in the frequency and reach of infectious disease epidemics. Air travel can rapidly connect any two points on the planet, and this has the potential to cause swift and broad dissemination of emerging and re-emerging infectious diseases that may pose a threat to global health security.
Population migration, spread of COVID-19, and epidemic prevention and control: empirical evidence from China | BMC Public Health | Full Text (biomedcentral.com)
Human Mobility and the Global Spread of Infectious Diseases: A Focus on Air Travel (nih.gov)
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