• Yews
  - taxine alkaloids..extremeely toxic!
  - remember Taxus brevifolia?
• Rhododendrons and Azaleas
  - leaves and honey are toxic
• Many spring wildflowers, including Lily-Of-The-Valley
  - cardiac glycosides

• Pyrethrum
  - from Chrysanthemums
  - nerve poison for insects
  - usually no problem for humans, breaks down in sunlight
• Rotenone
  - from tropical legume roots
  - also non-persistent, originallly used as fish poison
• Neem
  - tropical tree, feeding deterrent

• Hypersensitive immune response
  - hay fever (allergic rhinitis)
  - asthma also immune related
• The Immune System
  - self verses non-self
  - immune system attacks foreign substances (called antigens)
  - immune system makes antibodies to recognize antigens and defend against them
  - desease-causing organisms have antigens that the immune system can recognize

• Avoidence
• Antihistimines to treat symptoms
• Immunotherapy to block the allergic response

• Food Allergies
  - Various symptoms
  - Various causes

There are millions of different antibodies in your body, most never find an antigen Your immune system "remembers" which antigens it has been exposed to This results in immunity to disease-causing organisms
A second response may happen so quickly that you never know you were exposed to the antigen This is why you develop immunity to many disease-causing organisms and viruses Allergic rhinitis is your immune system responding inappropriately	Mast Cells - line surface of respiratory tract - respond to antibody signals - histamine release - histamine induces mucus production, sneezing, etc.

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