The BMJ (formerly British Medical Journal) estimates that 1 in 6 people in the industrialized world suffers from seasonal pollen allergies, also called hay fever.
„ BMJ ” (endine „British Medical Journal ”) on välja arvestanud, et tööstusmaades kannatab kuuest inimesest üks sesoonse õietolmuallergia all, mida kutsutakse ka heinapalavikuks.