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Viruses use the same receptors as neuropeptides to enter into a cell, and depending on how much of the natural peptide for a particular receptor is around and available to bind, the virus that fits that receptor will have an easier or harder time getting into the cell. Because the molecules of emotion are involved in the process of a virus entering the cell, it seems logical to assume that the state of our emotions will affect whether or not we succumb to viral infection.

Molecules of Emotion: The Science Behind Mind-Body Medicine