Quince Allergy: Birch Cross-Reactivity, OAS, and Why Cooked Quince Is Safe
Quince pollen and fruit allergy is a Rosaceae birch-PR-10 cross-reactivity affecting up to 70 percent of birch-allergic patients, with heat-labile Cyd o 1 that denatures on cooking. Raw quince triggers oral tingling and lip swelling in birch-sensitized patients. Crucially, Cyd o 1 is heat-labile — cooking denatures it, so quince jam, jelly, and membrillo are generally well tolerated. Quince trees are insect-pollinated and are not a significant hay fever source.
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Key facts
Quince (Cydonia oblonga) belongs to Rosaceae and its major pollen allergen Cyd o 1 is a Bet v 1 homolog (PR-10) — meaning approximately 70 percent of birch-allergic patients cross-react with quince pollen and fruit.
Cyd o 1 (quince Bet v 1 homolog) is heat-labile — quince jam and cooked quince dishes are typically tolerated by patients who react to raw quince fruit or quince pollen through pollen-food allergy syndrome.
Quince pollinates in April and May in the northern hemisphere, concurrent with apple, pear, and cherry — creating a compound Rosaceae spring pollen burden for polysensitized patients.
The oral allergy syndrome rate in Rosaceae-pollen-sensitized patients who consume raw quince fruit approaches the rate seen with peach and apple, reflecting the conserved PR-10 protein structure across the family.
What Is Quince Allergy?
Quince allergy is a pollen-food allergy syndrome (PFAS) driven by Cyd o 1 — a Bet v 1 homolog (PR-10 protein class) in quince fruit (Cydonia oblonga, Rosaceae) that cross-reacts with IgE antibodies generated against birch pollen Bet v 1.
The result is oral allergy syndrome (OAS): oral tingling, lip pruritus, and mild throat irritation appearing within minutes of eating raw quince. Quince trees are insect-pollinated and are NOT a significant aeroallergen — respiratory hay fever from quince pollen does not occur under normal conditions. No pollen allergens from quince have been characterized by WHO/IUIS.
The clinical story is entirely about the fruit and its relationship to the birch pollen sensitization network. The most practical and actionable insight for patients is the heat-lability of Cyd o 1: because PR-10 proteins are denatured at cooking temperatures, quince jam, quince jelly, and membrillo (the traditional Spanish quince paste used in bocadillo pairings) are generally well tolerated even by birch-allergic patients who react to raw quince. This cook-versus-raw distinction makes quince allergy management significantly more straightforward than LTP-mediated fruit allergies, where cooking does not reliably reduce reactivity.
Quince is widely used in jams, preserves, and cooked preparations across Mediterranean and Middle Eastern cuisines and is increasingly available in US specialty markets.
Symptoms of Quince Allergy
Recognizing symptoms early helps you get the right treatment faster.
Oral tingling and pruritus
mildThe earliest and most characteristic symptom of quince OAS — tingling and itching of the lips, tongue, and oral mucosa beginning within 2 to 10 minutes of eating raw quince.
Lip swelling
mildMild to moderate lip edema may accompany the oral tingling in Cyd o 1-sensitive patients; typically resolves within 20 to 30 minutes.
Throat pruritus
mildPosterior pharyngeal and palatal itch characteristic of airborne pollen deposition or food cross-reactive contact with oropharyngeal mucosa.
Tannin astringency (non-allergic)
mildThe drying, puckering sensation from underripe raw quince is caused by soluble tannins — a pharmacological response affecting all consumers, not an immune reaction. Distinguish from OAS pruritus.
Mild throat tightness
mildOccasional mild throat tightness may accompany OAS in higher-sensitization individuals; this is distinct from anaphylactic throat closure and typically resolves promptly.
Systemic urticaria (rare)
moderateGeneralized hives after quince exposure are unusual with pure PR-10 OAS but can occur if the patient also has LTP sensitization. Seek evaluation if urticaria develops after eating quince.
When to see a doctor
Quince allergy symptoms are those of pollen-food allergy syndrome (OAS), characteristically limited to the oropharynx and appearing within 2 to 10 minutes of eating raw quince. The reaction is typically brief and self-limited, resolving within 20 to 30 minutes without treatment as the fruit is swallowed and gastric acid rapidly denatures Cyd o 1. Rarely, patients with high-level birch sensitization experience more pronounced reactions, but systemic urticaria, angioedema beyond the mouth, or anaphylaxis are unusual with PR-10-mediated quince OAS and should prompt evaluation for co-occurring LTP sensitization. The majority of patients with quince OAS have identical or similar reactions to raw apple, raw pear, and other birch-Rosaceae cross-reactive fruits. Importantly, the astringency of underripe raw quince — caused by high tannin content — can mimic or mask OAS symptoms; distinguishing tannin-caused puckering (universal, non-immune) from OAS pruritus (immune-mediated, selective to sensitized individuals) is important for accurate self-reporting to an allergist.
Quince and Asthma
Quince is not a recognized asthma trigger through the pollen route because the tree is insect-pollinated and produces no clinically significant airborne pollen. In patients with birch-pollen-triggered asthma, food cross-reactivity via PR-10 (Cyd o 1) generally does not extend to the lower airways — PR-10 proteins are rapidly denatured in the oral cavity and gastrointestinal tract, preventing systemic allergenic exposure. True food-triggered asthma from quince ingestion has not been documented. Patients with quince OAS who also have asthma are almost certainly reacting to separate inhalant triggers for their asthma (birch pollen, grass, dust mites) rather than quince itself. A board-certified allergist can evaluate the distinct contributions of each allergen source.
Complications of Quince Allergy
Quince OAS driven by PR-10/Cyd o 1 is generally a mild and self-limited condition with few complications. The most common complication is unnecessary dietary restriction — patients who experience OAS with raw quince and avoid all quince products unnecessarily eliminate quince jam, membrillo, and cooked preparations that are almost always well tolerated after Cyd o 1 is denatured by heat. This unnecessary restriction reduces dietary and culinary diversity without benefit. A small subset of birch-allergic patients with very high Bet v 1 IgE levels may experience more pronounced OAS reactions, and any patient who develops systemic symptoms (generalized urticaria, angioedema beyond the mouth, dyspnea) after quince should be evaluated for co-occurring nsLTP or profilin sensitization that could indicate higher anaphylaxis risk. The quince tannin bezoar risk (analogous to the persimmon bezoar phenomenon) theoretically applies to consumption of large quantities of raw astringent quince but is primarily relevant in excess consumption scenarios.
Unnecessary dietary restriction
Patients avoiding all quince products due to raw quince OAS miss out on well-tolerated cooked preparations — quince jam and membrillo are generally safe when Cyd o 1 is heat-denatured.
Missed co-sensitization (LTP)
If quince reactions extend beyond the oral cavity to include systemic symptoms, co-occurring LTP sensitization should be evaluated — this would change management significantly toward epinephrine prescription.
Diagnostic confusion with tannin astringency
The tannin puckering of raw quince can mask or be mistaken for OAS, leading to uncertainty about the true cause — allergist evaluation with Bet v 1 component testing resolves this.
What Causes Quince Allergy?
Quince allergy is caused by cross-reactive IgE antibodies generated against birch pollen Bet v 1 (the major birch allergen) recognizing Cyd o 1 — the Bet v 1 homolog in quince fruit. This is the classic birch-Rosaceae pollen-food cross-reactivity network: approximately 70 percent of birch-pollen-allergic patients develop OAS symptoms to at least one Rosaceae fruit through this pathway.
Common quince (edible fruit tree)
Cydonia oblonga
Japanese flowering quince (ornamental, no edible fruit relevance)
Chaenomeles japonica
Chinese flowering quince (ornamental garden shrub)
Chaenomeles speciosa
How it works
Quince allergy operates through Type I IgE-mediated hypersensitivity via the PR-10 pollen-food cross-reactivity mechanism. Cyd o 1 in raw quince fruit is recognized by pre-formed IgE antibodies directed against birch pollen Bet v 1, due to high structural similarity between PR-10 proteins across the Fagales-Rosaceae network. IgE binding to Cyd o 1 cross-links mast cells and basophils in the oral mucosa, triggering localized histamine release within 2 to 10 minutes of exposure. The reaction is typically confined to the oropharynx because Cyd o 1 is rapidly denatured by gastric acid and proteases — unlike LTP proteins (Pru p 3 class) which resist digestion. Heat denaturation at cooking temperatures (above approximately 60°C) also destroys Cyd o 1 allergenicity, explaining why cooked quince products are tolerated.
Quince is one of the less commonly encountered Rosaceae fruits in North American contexts, but its OAS potential has been documented with Cyd o 1 characterization. The Bet v 1/PR-10 cross-reactivity mechanism is well understood: Bet v 1 and its plant food homologs (Mal d 1 in apple, Pru p 1 in peach, Pyr c 1 in pear, Cyd o 1 in quince) share structural features that allow birch-IgE antibodies to bind to fruit proteins with sufficient affinity to activate mast cells in oral and esophageal mucosa.
The reaction is characteristically confined to the oropharynx in most patients — PR-10 proteins are heat-labile and rapidly digested by gastric acid, preventing systemic absorption and limiting reactions to the upper gastrointestinal tract. Flowering quince (Chaenomeles japonica and C.
speciosa — ornamental garden shrubs also called 'Japanese quince') are related Rosaceae ornamentals that are also insect-pollinated with no characterized pollen allergens; they share the ornamental rather than edible context with common quince and have no significant independent allergy relevance.
Risk factors to watch for
Confirmed birch pollen IgE allergy
The primary risk factor for quince OAS is birch pollen sensitization — Bet v 1 IgE is the cross-reactive antibody recognizing Cyd o 1 in raw quince fruit.
Living in northern US / northern Europe
Birch pollen allergy (and the associated PR-10 food syndrome) is most prevalent in regions with abundant birch trees — the northeastern US, northern Europe, Scandinavia, and Canada.
Multiple Rosaceae fruit OAS
Patients who already react to raw apple, raw pear, or raw peach (via Pru p 1 PR-10) are likely to also react to raw quince — the Bet v 1/PR-10 network is consistent across Rosaceae.
The Allergy Cascade
Exposure
Allergen contact
Detection
Immune recognition
IgE Response
Antibody production
Mast Cells
Histamine release
Symptoms
Allergic reaction
1.Exposure
Allergen contact
2.Detection
Immune recognition
3.IgE Response
Antibody production
4.Mast Cells
Histamine release
5.Symptoms
Allergic reaction
How Is Quince Allergy Diagnosed?
Diagnosing quince OAS begins with confirming the underlying birch pollen sensitization — this is the primary driver of Rosaceae pollen-food syndrome. Skin prick testing with birch pollen extract and specific IgE measurement for Bet v 1 (the major birch allergen component) are the foundational tests. A positive Bet v 1 IgE result in a patient who reports oral symptoms after eating raw quince strongly supports Cyd o 1 cross-reactive OAS as the diagnosis. Prick-to-prick testing with fresh raw quince can directly demonstrate IgE binding to quince fruit proteins. For comprehensive characterization of the PR-10 food syndrome spectrum, testing with other Rosaceae fruits (apple, pear, peach) and Bet v 1 component IgE provides the full cross-reactivity picture. The practical diagnostic point is distinguishing OAS from tannin astringency: OAS is selective to sensitized individuals, produces pruritus and swelling, and may occur with a fully ripe quince; tannin astringency is universal, produces puckering-dryness without itch or swelling, and is most pronounced with unripe fruit. For patients who also want to evaluate their broader environmental allergen profile, at-home allergy testing services such as Curex offer panels covering 40+ common allergens including tree pollens and results typically within 5 days — often with insurance coverage.
Specific IgE — Bet v 1 Component
Quantitative measurement of IgE specific to Bet v 1 (the major birch allergen and PR-10 cross-reactivity marker) identifies genuine primary birch sensitization driving quince OAS.
Prick-to-Prick Test (Fresh Raw Quince)
A lancet is pricked into fresh raw quince flesh and then into the patient's skin; wheal formation confirms IgE binding to quince fruit proteins including Cyd o 1.
Skin Prick Test — Birch Pollen
Standard SPT with birch pollen extract confirms birch sensitization — the foundation of the Rosaceae PR-10 pollen-food syndrome. Positive result supports Cyd o 1 cross-reactivity as the OAS mechanism.
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Quince OAS management is largely behavioral because the condition is mild and self-limiting. The cornerstone practical insight is the heat-lability of Cyd o 1: cooked quince preparations are almost universally well tolerated, meaning the management strategy for most patients is simply 'avoid raw quince, enjoy cooked quince products freely.' For the underlying birch pollen allergy driving the cross-reactivity, allergen immunotherapy targeting birch pollen can reduce the sensitization driving quince OAS — patients who undergo successful birch SLIT or SCIT often report reduced OAS reactivity to Rosaceae fruits as a secondary benefit. No specific food immunotherapy protocol for Cyd o 1 exists or is needed given the benign and self-limited nature of PR-10 OAS.
Raw Quince Avoidance
Avoiding raw quince eliminates the primary OAS trigger. Cooked quince preparations (jam, jelly, membrillo, baked dishes) with Cyd o 1 denatured by heat are generally well tolerated.
No medication — dietary measure
Complete elimination of raw quince exposure prevents OAS reactions; cooked substitutes provide equivalent culinary function
Cook or Process Quince Before Eating
Heat treatment above approximately 60°C denatures Cyd o 1. Quince jam, membrillo, jelly, and baked quince are typically well tolerated by Bet v 1-sensitized patients who react to raw quince.
No medication — food preparation modification
Evidence from PR-10 food syndrome research consistently shows cooking denatures Bet v 1 homologs, reducing or eliminating OAS reactivity in the large majority of sensitized patients
Oral Antihistamines (Symptomatic)
Antihistamines can relieve residual oral itching or mild swelling after accidental raw quince exposure, though they are typically not required for the brief, self-limited OAS episode.
Cetirizine (Zyrtec), fexofenadine (Allegra), loratadine (Claritin)
Moderate relief of histamine-mediated OAS symptoms; most OAS episodes resolve without treatment within 20 to 30 minutes
Allergen Immunotherapy — Birch Pollen
SLIT or SCIT targeting birch pollen allergen (Bet v 1) reduces primary sensitization and often results in secondary improvement of Rosaceae food PR-10 cross-reactions including quince OAS.
Birch pollen extract (subcutaneous) or sublingual birch pollen drops
Clinical trials of birch SCIT and SLIT show 60–85% reduction in seasonal rhinitis; secondary reduction in Bet v 1-driven food OAS is documented in multiple birch immunotherapy trials
| Feature | Traditional | Allergy Shots (SCIT) | Immunotherapy (SLIT)Recommended |
|---|---|---|---|
| Treats root cause | No | Yes | Yes |
| Long-lasting relief | No | Yes | Yes |
| At-home treatment | Yes | No | Yes |
| No office visits | Yes | No | Yes |
| Low side effects | Yes | Partial | Yes |
| Estimated cost | Partial | Partial | Yes |
Traditional
- NoTreats root cause
- NoLong-lasting relief
- YesAt-home treatment
- YesNo office visits
- YesLow side effects
- PartialEstimated cost
Allergy Shots (SCIT)
- YesTreats root cause
- YesLong-lasting relief
- NoAt-home treatment
- NoNo office visits
- PartialLow side effects
- PartialEstimated cost
Immunotherapy (SLIT)
Recommended- YesTreats root cause
- YesLong-lasting relief
- YesAt-home treatment
- YesNo office visits
- YesLow side effects
- YesEstimated cost
Immunotherapy for Quince Allergy and Birch Cross-Reactivity
Instead of masking symptoms, immunotherapy retrains your immune system.
Patients with quince OAS are almost certainly sensitized to birch pollen (Bet v 1) as the primary driver — and birch pollen is an excellent immunotherapy target with multiple high-quality clinical trials supporting both subcutaneous and sublingual treatment efficacy. Treating the primary birch sensitization with immunotherapy addresses the root cause driving quince OAS: as Bet v 1-specific IgE levels decrease and immune tolerance develops, the cross-reactive recognition of Cyd o 1 in quince fruit diminishes proportionally. This is a significant therapeutic benefit beyond the seasonal rhinitis relief — multiple birch immunotherapy trials document secondary improvement in Rosaceae fruit OAS reactions including apple, pear, and cherry as collateral benefits of birch desensitization. Sublingual immunotherapy drops, offered by providers like Curex with plan-specific pricing (https://getcurex.com/learn/curex-pricing), deliver custom-formulated birch pollen drops under the tongue at home each day, providing convenient spring tree pollen desensitization without weekly clinic visits. In a real-world Curex study of 2,897 patients on at-home sublingual immunotherapy (Tharpe et al., Frontiers in Allergy, 2026), clinically meaningful symptom improvement rose to 45% of patients by two years, quality-of-life improvement reached 90.7%, adherence was over 90%, and no anaphylaxis was reported. For patients with quince OAS as their only food reaction and mild spring birch rhinitis, the practical management of raw quince avoidance and cooked quince freedom may be sufficient without requiring immunotherapy. For patients with moderate-to-severe birch rhinitis with significant seasonal impact plus multiple Rosaceae food reactions, birch immunotherapy provides broader benefit that justifies the commitment.
Confirm Birch/Bet v 1 Sensitization
Specific IgE for Bet v 1 confirms the primary sensitization driving quince OAS and guides immunotherapy target selection.
Apply Cooking Rule Immediately
Begin eating cooked quince products freely while pursuing immunotherapy — this practical change provides immediate benefit without waiting for treatment effects.
Start Birch SLIT if Rhinitis is Significant
Birch pollen SLIT drops provide disease modification for spring rhinitis and secondary improvement of Rosaceae fruit OAS including quince cross-reactivity.
Monitor Food OAS Improvement
As immunotherapy progresses over 1 to 3 years, reassess tolerance to raw quince and other Rosaceae fruits — most patients report improvement in food OAS severity.
“Birch pollen SLIT and SCIT show 60–85% reduction in spring rhinitis; secondary reduction in Rosaceae fruit OAS documented in clinical trials of birch immunotherapy”
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Living With Quince Allergy
Living with quince allergy is relatively low-burden once the heat-lability principle is understood. Because quince is traditionally eaten cooked — in jams, pastes, and preserves — the dietary restriction is primarily about raw quince, which is rare in US culinary contexts anyway. The main practical challenge is awareness in restaurant settings where fresh quince might occasionally appear in salads or charcuterie boards, and in specialty food contexts such as Middle Eastern and Mediterranean grocery stores where fresh quince is sold during fall harvest season. Many patients with quince OAS are initially unaware that their reaction was to quince specifically (rather than some other fruit or ingredient in a dish) — the clear identification of the trigger through allergist testing provides genuine relief and clarity. Understanding that your quince OAS is almost certainly driven by your birch pollen allergy — and that treating the birch allergy is the path to long-term food OAS improvement — reframes quince allergy from a standalone food condition to a treatable component of a known pollen sensitization.
The jam is safe — the raw fruit is not
Quince jam, quince jelly, membrillo, and baked quince are safe for birch-allergic patients because heat denatures Cyd o 1. This is the fundamental management principle. Enjoy quince preserves freely; avoid raw quince preparations.
The broader Rosaceae pattern
If you react to raw quince, evaluate whether you also react to raw apple, raw pear, or raw peach — the Bet v 1 PR-10 network affects the entire Rosaceae family. Many patients with quince OAS have a wider pattern of raw fruit reactions they had not connected until an allergist evaluation.
When cooking resolves it and when it doesn't
The cooking-resolves-OAS principle applies to Cyd o 1 (PR-10 class, heat-labile). If you react to cooked quince as well as raw, suspect LTP sensitization (heat-stable) as an additional component and discuss with your allergist. The two pathways require different management.
Quince Fruit Availability and OAS Seasonality
Quince OAS risk follows the fruit's harvest and market availability rather than a pollen season. Fresh quinces are harvested from September through December in temperate Northern Hemisphere regions; they appear in US farmers markets and specialty stores during fall and early winter, with imported Mediterranean varieties sometimes available through January. Quince jam, jelly, membrillo, and marmalade are available year-round in specialty food stores and Mediterranean markets, but these cooked products generally do not cause OAS reactions in birch-sensitized patients due to Cyd o 1 heat lability. The quince tree's pollen season (insect-pollinated, spring-flowering) is clinically irrelevant for respiratory allergy purposes. The Rosaceae OAS syndrome can be more symptomatic during and immediately after birch pollen season (spring) when mucosal IgE levels are elevated, but quince OAS can occur whenever the fruit is consumed.
September - December
high intensity
March - May
low intensity
How to Prevent Quince Allergy Reactions
Prevention of quince OAS is simple and highly effective because the allergen (Cyd o 1) is heat-labile. The primary prevention strategy is cooking quince before consumption — a step that is standard in most traditional quince preparations anyway, since raw quince is astringent and essentially inedible in most varieties. For raw quince preparations (fresh salads, rare culinary applications), avoidance is the prevention strategy. Managing the underlying birch pollen allergy through immunotherapy provides long-term prevention of the sensitization driving Rosaceae OAS including quince.
Cook quince before eating
Traditional quince preparations — jam, jelly, membrillo, baked quince, and paste — are cooked at temperatures that fully denature Cyd o 1, making them safe for birch-allergic patients.
Identify raw quince in dishes
At restaurants or social events where quince appears in fruit salads, fresh chutney, or raw preparations, confirm the cooking status before eating if you have confirmed Rosaceae OAS.
Consider birch immunotherapy
Treating the primary birch sensitization with SLIT or SCIT reduces the Bet v 1 IgE levels driving quince cross-reactivity, providing long-term prevention of Rosaceae fruit OAS.
Distinguish quince from persimmon astringency
Raw quince has tannin astringency (puckering sensation from tannins, not immune-mediated) AND Cyd o 1 OAS potential (immune-mediated tingling and swelling) — you may experience both simultaneously, but they have different causes.
Prognosis for Quince Allergy
The prognosis for quince OAS is excellent. PR-10-mediated OAS is inherently mild and self-limited, with reactions confined to the oropharynx in the vast majority of patients and resolving within 30 minutes without treatment. The cooking-resolves-allergenicity principle means that quince remains an enjoyable food in its most common traditional forms even for sensitized patients. Birch immunotherapy, by reducing the primary Bet v 1 sensitization, progressively reduces quince OAS reactivity over time — most patients treated for birch pollen allergy with SLIT report improved tolerance to Rosaceae fruits as a secondary benefit. Unlike LTP food allergy (e.g., persimmon, peach in Art v 3-sensitized patients), PR-10-mediated quince OAS carries essentially no anaphylaxis risk from the quince fruit itself, and epinephrine prescription is not warranted on quince OAS grounds alone.
Key takeaways
Cyd o 1 (quince Bet v 1 homolog) is heat-labile — quince jam, jelly, and cooked preparations are safe for birch-allergic patients
Quince is insect-pollinated and not a hay fever source; the allergy is entirely about the fruit's cross-reactivity with birch IgE
Birch pollen immunotherapy (SLIT or SCIT) reduces the primary sensitization and progressively improves Rosaceae fruit OAS including quince
Anaphylaxis risk from quince PR-10 OAS is essentially absent — systemic reactions to quince should prompt evaluation for co-occurring LTP sensitization
Diet and Quince Allergy: The Raw vs. Cooked Distinction
The most important dietary principle for quince OAS is the cook-vs-raw distinction: Cyd o 1 is heat-labile (PR-10 class), meaning cooking denatures the allergen and makes cooked quince products safe for birch-sensitized patients. This contrasts sharply with LTP-mediated fruit allergy (like persimmon) where heat stability means cooked products retain allergenicity. Quince is traditionally a cooked fruit — it is far too astringent to eat raw in most varieties, and virtually all traditional quince products (jam, jelly, paste, preserves) involve cooking. The Birch-Rosaceae PR-10 network extends to apple, pear, cherry, peach, plum, apricot, and hazelnuts — birch-sensitized patients with quince OAS may have similar raw-fruit reactions across these foods. Cooked versions of each are generally well tolerated.
Foods that help
Cooked quince jam and jelly
Heat-denatured Cyd o 1 makes traditional quince preserves safe for birch-allergic patients — enjoy freely.
Membrillo (quince paste)
Traditional Spanish quince paste is cooked and concentrated — Cyd o 1 is denatured; safe for most birch-sensitized patients.
Foods to limit
Raw quince
Contains intact, heat-sensitive Cyd o 1 (Bet v 1 homolog) that triggers oral allergy syndrome in birch-sensitized patients.
Raw apple, pear, cherry, peach (if Rosaceae OAS present)
The same birch PR-10 cross-reactivity driving quince OAS extends to other raw Rosaceae fruits — cooking these also typically resolves reactivity.
Quince allergy is a birch allergy presenting at the farmers market. The patient who tolerates birch immunotherapy will typically also tolerate raw quince — but it takes years of treatment, and I advise cooking quince in the interim since the Cyd o 1 PR-10 protein denatures at standard cooking temperatures.
Frequently Asked Questions
Raw quince triggers oral tingling because it contains Cyd o 1 — a Bet v 1 homolog (PR-10 protein) that cross-reacts with IgE antibodies generated against birch pollen. These IgE antibodies recognize Cyd o 1 in raw fruit and activate mast cells in the oral mucosa, causing localized histamine release and the characteristic tingling, pruritus, and lip swelling of oral allergy syndrome. Quince jam is safe because heat during jam-making denatures Cyd o 1 — PR-10 proteins unfold and lose their IgE-binding structure at cooking temperatures above approximately 60°C. Once denatured, the proteins are no longer recognized by birch IgE antibodies, and eating the jam produces no reaction. This is why virtually all traditional quince preparations — jam, jelly, membrillo, baked dishes — are tolerated by birch-allergic patients.
Medical References
- [1]Ballmer-Weber BK, Hoffmann-Sommergruber K. Molecular basis for bakers' hypersensitivity and pollen-food syndrome. Clin Rev Allergy Immunol. 2011;41(2):118–125.
- [2]Breiteneder H, Radauer C. A classification of plant food allergens. J Allergy Clin Immunol. 2004;113(5):821–830.
- [3]Ebner C, Hirschwehr R, Bauer L, et al. Identification of allergens in fruits and vegetables: IgE cross-reactivities with birch pollen allergens Bet v 1 and Bet v 2. J Allergy Clin Immunol. 1995;95(5 Pt 1):962–969.
- [4]Fernández-Rivas M, Benito C, González-Mancebo E, De Durana DA. Allergies to fruits and vegetables. Pediatr Allergy Immunol. 2008;19(8):675–681.
- [5]American College of Allergy, Asthma & Immunology (ACAAI). Oral allergy syndrome (pollen-food allergy syndrome).
- [6]D'Amato G, Cecchi L, Bonini S, et al. Allergenic pollen and pollen allergy in Europe. Allergy. 2007;62(9):976–990.
- [7]Tharpe C, et al. Real-world outcomes of personalized sublingual immunotherapy for environmental allergies delivered through a telemedicine platform. Frontiers in Allergy. 2026;7:1865860.
- [8]Schaffer FM, Naples AR, Ebeling M, Hulsey TC, Garner LM. The safety of self-administered allergen immunotherapy during the buildup and maintenance phases. Int Forum Allergy Rhinol. 2015;5(2):149-156.
This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about a medical condition. Content reviewed by board-certified allergists at Curex.
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