UNITED NEWS INTERNATIONAL (UNI) — The day when peanut allergies become preventable may be fast approaching.

Researchers at the University of Michigan have developed a nasal spray that reportedly vaccinates against peanut allergies in mice.

The university said in a press release April 11 the vaccine works by re-training the immune cells on how to respond to peanut allergens.

Researchers have so far only experimented on mice.

They first established peanut allergies in the mice, then gave them three monthly doses of the nasal spray vaccine.

The mice didn’t have any allergic reactions to the peanuts for up to two weeks after their final dose.

This means they didn’t show any of the symptoms humans with peanut allergies can experience, such as itching or troubled breathing.

The study was published in the Journal of Allergy and Clinical Immunology.

Study authors hope their findings lead to a long-term solution for humans with peanut allergies.