The pattern by which communicable diseases (including HIV/AIDS)spread is usually by a combination of expansion and hierarchical diffusion.

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Expansion diffusion refers to the spread of a disease outwards from a source location, while hierarchical diffusion refers to the spread of a disease through social or economic networks. Many communicable diseases, including HIV/AIDS, spread through a combination of these two forms of diffusion.

The Pattern by Which Communicable Diseases (Including HIV/AIDS)spread Is Usually