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PostPosted: Mon Jan 15, 2007 9:06 pm 
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Joined: Mon Jul 03, 2006 8:23 pm
Posts: 190
http://www.ncbi.nlm.nih.gov/entrez/quer ... s=17069095

1: Ann Allergy Asthma Immunol. 2006 Oct;97(4):443-5. Links
Late diagnosis of tree nut and sesame allergy in patients previously sensitized but tolerant to peanut.

* Beausoleil JL,
* Spergel JM.

Division of Allergy and Immunology, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104, USA.

BACKGROUND: Recent studies have indicated that tolerance to peanut can occur in patients with a history of peanut allergy. Tree nut and sesame allergies have been reported to occur at increased incidence in patients with peanut allergy. Although the coexistence may be simply due to a predisposition to food allergy in these individuals, cross-reactivity has been demonstrated between peanut and tree nuts and between peanut and sesame seed. OBJECTIVE: To describe 3 patients previously sensitized but tolerant to peanut who were subsequently diagnosed as having either tree nut or sesame allergy. METHODS: All the patients had a clinical history of peanut sensitivity and underwent follow-up peanut skin testing to commercial extracts using a bifurcated needle followed by a graded peanut challenge. One patient had a previous positive radioallergosorbent test reaction to sesame and underwent a graded sesame challenge. RESULTS: All the patients had negative peanut challenge results. Two patients subsequently had exposure to tree nuts at home and had systemic reactions and positive skin test reactions to the incriminated tree nut. One patient had a positive challenge reaction to sesame. CONCLUSION: Demonstration of tolerance to peanut may falsely reassure patients and physicians that patients no longer need to avoid tree nuts or sesame. Tree nut and sesame allergies can exist or develop in patients despite the development of tolerance to peanut.

PMID: 17069095 [PubMed - indexed for MEDLINE]


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PostPosted: Mon Jan 15, 2007 11:25 pm 
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Joined: Tue Nov 29, 2005 4:04 pm
Posts: 2044
Location: Gatineau, Quebec
So they are saying that these folks had outgrown their peanut allergy but grown into a tree nut or sesame seed allergy, right?

Interestingly enough, that happened to a family in my support group. Their child outgrew his peanut allergy, but not long after tested positive to some tree nuts. It doesn't seem fair, does it?

K.

_________________
Karen, proud Mom of
- DS1 (12 yrs): allergic to cashews, pistachios, Brazil nuts, potatoes, some legumes, some fish, pumpkin seeds; OAS
- DS2 (1o yrs): ana. to dairy, eggs, peanuts; asthma


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PostPosted: Tue Jan 23, 2007 12:43 pm 
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Joined: Wed Jul 26, 2006 1:56 pm
Posts: 86
Location: Kanata, Ontario
when my son was at his allergist's this summer the allergist told me, as my son tested positive to sesame, that there the chemical composition of peanuts and sesame are identical.
Reassuring...

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Self- allergies to penicillan, sulpha, environmental
DS- 10, allergic to peanuts, tree nuts, sesame and chick peas (who'd a thought?)
DSecondS - 8, none!


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PostPosted: Sat Feb 03, 2007 1:56 am 
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Joined: Tue Mar 22, 2005 6:53 pm
Posts: 1454
Location: Canada
Interesting. I didn't think I was allergic to sesame, but I haven't had any sesame for years and years due to MFA issues and also to the fact that my youngest sister has a sesame allergy. I had a major hive on a SPT to sesame----so I'm probably allergic.


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