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A Trojan not being a virus while tecnically true, (it is not truly self replicating) is just splitting hairs. Its like saying a whisker is not really hair.
Trojans do nastly stuff and are unwittingly transfered from computer to computer, some Trojans can forward or send themselves via email and/or messenger sevices, pretty much makes it a virus if not technically 100% true.
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no splitting hairs involved, is a fact as a little light reading will soon sort
eg
Difference Between Virus and Trojan | Difference Between | Virus vs Trojan