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Anaphylaxis is an immediate and severe allergic reaction to a substance (e.g. food or drugs). Symptoms of anaphylaxis include breathing difficulties, loss of consciousness and a drop in blood pressure.  

'''Anaphylaxis''' is an immediate and severe allergic reaction to a substance (e.g. food or drugs). Symptoms of anaphylaxis include breathing difficulties, loss of consciousness and a drop in [[blood pressure]].  

This condition can be fatal and requires immediate medical attention.<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#a</ref>

This condition can be fatal and requires immediate medical attention.<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#a</ref>