Around 1989, I read a short story, pretty sure it was in Analog, about a human who chats up an alien at some extraterrestrial bar. The alien tells him that his species tried to eradicate humans with a virus which turned out to be the common cold. Anybody know the name/author of the story?

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“Nasty, Brutish &...” by Harry Turtledove.

Published in 1989 in Analog. It’s in his collection Departures.

The common cold virus was engineered by the ancient Foitani before the Suicide Wars. A Foitan expedition had visited Earth and one of their researchers was killed by humans. (He or another member of his expedition apparently managed to abduct a male and female specimen.) The Foitani decided that humans were too violent and erratic to be allowed to develop into an advanced space-faring civilization, and so, per standard Foitan operating procedures, a respiratory virus was engineered which was supposed to be lethal, communicable, and incurable, and was introduced into the human population. The virus was indeed communicable and incurable but did not prove to be lethal, and it eventually came to be known as the common cold.

The Foitani did not revisit Earth before their empire was destroyed and their few surviving colonies were plunged into dark ages following the Suicide Wars. Millennia later, when spacefaring humans ranged as far as the Great Ones had at their height, modern Foitani who knew of their species' creation of the virus were sometimes perplexed and even a little offended that humans were not extinct.

Source, summary source

Referenced here, found with Google analog alien “common cold” short story.Then found with turtledove short story common cold after that.

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    Thank you very much, @Stormblessed
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    Commented Oct 6, 2019 at 3:20

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