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Host range refers to the spectrum of host cells that a virus can infect. It is determined by specific interactions between viral proteins and host cell receptors.
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Viral Tropism: The specificity of a virus for a particular host tissue, determined by receptor interaction.
Zoonosis: A disease that can be transmitted from animals to humans, often involving changes in the virus's host range.
Receptor Binding: The process by which a virus attaches to specific molecules on the surface of a potential host cell.