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Viruses have several ways of spread, some do it by air while others through direct contact or contaminated food or water. All depends what virus it is.
For example, the Human Immunodeficiency Virus (HIV) is spread by direct contact only, same goes for the Herpes family viruses like HSV, HPV and others. The Influenza virus, like the one in the latest outbreak (H1N1 type), is spread by air, i.e. air droplets expelled by another human in the vicinity.

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