Don't eat Raw Cookie dough or anything with uncooked flour.

                                  Don’t lick that whisk — a study published Wednesday found that tasting raw products made with flour can make you dangerously ill. 

Creditkarsten Moran for The New York Times 

When I was going to BYU in the early 1970's they said don't eat raw cookie
dough because of the raw egg.  This looks worse than the raw egg issue.
But ask Susan what happens if you eat raw egg.
Note the source is The New England Journal of Medicine,
The link below has a link to the medical journal.

Tasting uncooked foods made with flour can make you dangerously ill, according to a study published Wednesday in The New England Journal of Medicine. The report, which recounts the detective work that led to a recall of more than 10 million pounds of flour in the summer of 2016, confirms that a type of E. coli bacteria previously discovered lurking in wet environments like hamburger meat and leafy vegetables can also thrive in arid hosts.

“We’re not trying to ruin people’s holidays but we want them to be aware of the risks,” said Samuel J. Crowe, the lead author of the study and an epidemiologist with the division of food-borne, waterborne and environmental diseases at the Centers for Disease Control and Prevention.

“The bacteria is not uniformly distributed in a two-and-a-half pound bag of flour,” he said. “A small amount could get you really sick. I’ve had E. coli and salmonella and it’s pretty darn unpleasant.”

Because of concerns over raw eggs, precautions have long existed for licking batter-laced spoons and nibbling homemade cookie dough. But the new results expand both the array of raw goods to be concerned about — even homemade playdough! — and the reasons to be vigilant. More than a quarter of the 56 patients in the 24-state outbreak were hospitalized. One patient even went into kidney failure. All of the patients, whose ages ranged from 1 to 95, recovered.

Jan Hoffman. New York Times. NOv. 22, 2017