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Spider bites, even some from non-venomous spiders, can cause pain and swelling beyond the norm. Bee and wasp stings can be serious problems for those allergic to the venom. Anaphylactic shock is no myth. ... read more
"There is a essential genetic component to being affected, a condition called atopy. On the other hand, allergies can be built up over time with repeated or prolonged exposure."

allergic reactions flu jab 2007 uk - chronic nasal congestion