What are cashew nuts and why do they have a reaction?

A reaction to the cashew-nut allergy has been reported in a New York City hospital.

The New York Daily News reports that the hospital’s allergy unit was notified Tuesday of the possible outbreak.

No cases have been confirmed.

The outbreak is believed to be linked to the consumption of cashew butter in the hospital cafeteria, according to the paper.

The article states that doctors are investigating the possible cause.

It’s unclear if the cashews are contaminated or the butter is still in the kitchen.