SALZBURG, Austria, Aug. 8 (UPI) -- During allergic reaction scientists found the brain produces more neurons, formed in the hippocampus, but deactivates microglia, the brain's immune cells -- a reaction they say they do not understand, either the cause or the effect.
Season allergic rhinitis, more commonly known as hay fever, develops in response to something in the environment, such as mold spores or pollen, causing symptoms from a runny nose and itchy face to congestion and fatigue, but the effects of induced allergic reaction on the brains of mice surprised researchers.