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Macro viruses
Dowloaded apps from one to another and website's that purposely dowloaded viruses.
Plants have stronger cells walls. And viruses do spread to plants.
New viruses are released after the lytic cycle. ~Gradpoint/Novanet
Some computer viruses.
Most virus' are spread through the air. Airborne. Oh yeah. Airborne. Waddupp doe? ;D
It depends on which plague, but yes. Many viruses can be spread without touching a person due to the virus mutating and becoming airborne, or if the inflicted person touchs something that somebody else then touches.
Viruses can come from multiple sources, but the most common is removable media, from downloads off the Internet, and from e-mail attachments.
Closing schools helps to stop the spread of viruses. By allowing students, teachers and staff to stay home, the virus is not spread from one person to another, at least not at school.
A disease that cannot be spread from person to person is non-communicable. For example, lung cancer can make a person cough. But they won't give me cancer from coughing (though the cough can still spread viruses or bacteria). A person's Heart disease is not "catch-able".
No, computer viruses are spread via removable media, and the internet
Communicable diseases always spread from one person to another or from an animal to a person. The spread often occurs due to airborne viruses or bacteria, direct contact with infected blood or other bodily fluids.