activates whenever applications on the device are launched and prevents viruses from activating on the device.
But these are mostly used for scanning mail destined for other systems that are more vulnerable to viruses.
In the past viruses were designed to create a minor annoyance.
causes Most commonly sore throats are caused by viruses eg adenoviruses, influenza, and sometimes glandular fever (infectious mononucleosis ).
avian fluird flu is an affliction spread by the avian influenza viruses.