MARK SYKES / SCIENCE PHOTO LIBRARY MARK SYKES / SCIENCE PHOTO LIBRARY
Hay fever. Conceptual composite image of hay fever represented by a warning sign in a field of rapeseed (Brassica napus). Hay fever is caused by the pollen of specific seasonal plants such as rapeseed and is most prevalent during the haying or harvesting season. It affects people who are allergic to pollen.
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