Chipotle Mexican Grill (CMG - Get Report) shares were rising Wednesday following the company's latest earnings beat, but the foodborne illness outbreak that tanked the stock last week was a suspicious turn of events, according to Aaron Allen of food consultancy group Aaron Allen & Associates.

"A lot of things stacked up that made it suspicious," Allen told Bloomberg following a LinkedIn post on the subject this week. "And when you look at it from a statistical point of view, even more suspicious."

Allen noted that normally food borne illness outbreaks occur between December and May. Chipotle's occurred between August and December. 

Allen also noted that the number people sickened by the outbreaks are too high for the size and scope of Chipotle. 

Chipotle shares were up 1.43% to $353.60 in morning trading Wednesday. 

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