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1.
When someone misunderstands a comment on a thread, then wrongly reprimands the posters, who in turn try to clarify, yet the problem persists infecting many of the thread’s later comments. This person typically tends to do this regularly.
“Cleo just started another threadvirus, she does that all the time. I wish she would get a clue.”

“I wish people would look up what they don‘t understand, before they start another threadvirus with their ignorance.”

“Try a Google search, and stop starting a threadvirus!”
by Multidisciplinary TKBL January 11, 2009