There is an ingredient called arginine in the H1N1 nasal spray. Here's the first sentence from the Arginine entry in WikiPedia: Arginine (abbreviated as Arg or R) is an α-amino acid. The L-form is one of the 20 most common natural amino acids
It's an amino acid...so a building block for proteins...that the human body generally makes for itself (ie you don't need to eat it to have it). It is available in a variety of foods, including some seafood e.g. halibut, lobster, salmon, shrimp, snails, tuna.
Here's the link: http://en.wikipedia.org/wiki/Arginine
I also copied part of the VIS for the H1N1 Nasal Spray below....I can only imagine that if the spray triggered shellfish allergies, that they'd include it in the warning (as they did for egg allergies), as shellfish is a really common allergy.
Anyway, hope this helps!
Copied from the H1N1 Nasal Spray VIS: 2009 H1N1 LAIV 10/2/09
5 Some people should not get
the vaccine or should wait
You should not get 2009 H1N1 LAIV if you have a severe
(life-threatening) allergy to eggs, or to any other substance
in the vaccine. Tell the person giving you the vaccine if you
have any severe allergies.
2009 H1N1 LAIV should not be given to the following groups.
• children younger than 2 and adults 50 years and older
• pregnant women,
• anyone with a weakened immune system,
• anyone with a long-term health problem such as
- heart disease - kidney or liver disease
- lung disease - metabolic disease such as diabetes
- asthma - anemia and other blood disorders
• children younger than 5 years with asthma or one or more
episodes of wheezing during the past year,
• anyone with certain muscle or nerve disorders (such as
cerebral palsy) that can lead to breathing or swallowing
• anyone in close contact with a person with a severely
weakened immune system (requiring care in a protected
environment, such as a bone marrow transplant unit),
• children or adolescents on long-term aspirin treatment.
If you are moderately or severely ill, you might be advised to
wait until you recover before getting the vaccine. If you have
a mild cold or other illness, there is usually no need to wait.
Tell your doctor if you ever had:
• a life-threatening allergic reaction after a dose of seasonal
fl u vaccine,
• Guillain-Barré syndrome (a severe paralytic illness also
These may not be reasons to avoid the vaccine, but the
medical staff can help you decide.
2009 H1N1 LAIV may be given at the same time as most other
vaccines. Tell your doctor if you got any other vaccines within
the past month or plan to get any within the next month. H1N1