London Plane Tree Allergy Shots: Urban SCIT Guide for Pla a 1/2/3
London plane tree allergy shots (SCIT) address Pla a 1, Pla a 2, and Pla a 3 — three IUIS-characterized allergens making this urban hybrid a molecularly well-defined SCIT target. Pla a 2 drives sensitization in 76.3% of plane-allergic patients in Madrid cohorts. For dense-city residents in Manhattan, San Francisco, and urban corridors worldwide, the 20–40-day spring pollen season makes avoidance essentially impossible, strengthening the case for disease-modifying immunotherapy.
About Curex’s SCIT program
Curex’s at-home allergy shots (SCIT) are coming soon and focus on the most common environmental allergens:
- • Pollens — tree, grass, weed & ragweed
- • Pet dander — cat & dog
- • Dust mites
- • Molds — Alternaria & mold mix
London Plane Treeis covered here for general education and may not be part of Curex’s current treatment set. Join the waitlist and our care team will help confirm your options.
London Plane Tree Allergy Immunotherapy: How It Works
Allergy immunotherapy is the only long-term treatment that re-trains the immune system to stop overreacting to london plane tree — rather than just masking symptoms with antihistamines or steroids. By gradually exposing the body to controlled doses of london plane tree allergen, immunotherapy shifts the underlying allergic response and produces relief that often outlasts treatment by 7–10 years.
There are two evidence-based forms of london plane tree immunotherapy used today, both built on the same desensitization principle but delivered very differently.
of sustained relief after a complete immunotherapy course — the only allergy treatment with proven long-term effect after stopping.
Allergy Shots (SCIT)
Weekly injections of london plane tree extract in a clinic, escalating over 3–6 months until a maintenance dose is reached. Continued monthly for 3–5 years. Longest clinical track record for london plane tree allergy.
- Strongest evidence base for severe and polysensitized patients
- Covered by most insurance plans
- Requires 50–100+ in-person clinic visits across the full course
- Or at home with no clinic visits— Curex’s Virtual Shot Room model delivers the same SCIT program with live video supervision by trained Curex clinical staff for the first injection from each new vial or concentration and restarts after gaps or reactions.
Allergy Drops / Tablets (SLIT)
Daily drops or dissolvable tablets containing london plane tree extract, held under the tongue at home. Same desensitization principle, delivered without injections. WHO-recognized as an effective form of allergy immunotherapy since 2001.
- Taken at home — no weekly clinic trips, no needles
- Lower systemic reaction rate than allergy shots
- Curex offers prescription london plane tree immunotherapy drops with allergist oversight
The rest of this page goes deep on allergen-specific immunotherapy with shots — protocol, efficacy data, side effects, and cost. If you’d rather skip the clinic and treat london plane tree allergy with at-home drops, see how Curex sublingual immunotherapy compares below.
What is London Plane Tree?
The biology, taxonomy, and clinical fingerprint of London Plane Tree — the foundation of how SCIT targets it.
London plane (Platanus × acerifolia) lining a Manhattan street, releasing Pla a 1, Pla a 2, and Pla a 3 allergens from male catkins for 20–40 days each spring.
- Scientific name
- Platanus × acerifolia (syn. Platanus × hispanica)
- Family
- PlatanaceaePlane tree family
- Type
- Deciduous urban tree pollen (hybrid)
- Native to
- Bred in 17th-century Spain or England (Platanus occidentalis × P. orientalis)
- Allergen proteins
- Pla a 1 (major) — putative invertase inhibitor, 18 kDa, 44.7% IgE reactivity in Madrid cohortPla a 2 (major) — polygalacturonase, 43–45 kDa, 76.3% IgE reactivity in Madrid cohortPla a 3 — non-specific lipid transfer protein (nsLTP), 9 kDa, 23.7% IgE reactivity in Madrid cohort
- Particle size
- 17–22 μm (tricolporate)
- Avoidance difficulty
- Nearly impossible
How London Plane Tree Allergy Presents
Symptoms by body system — useful for distinguishing London Plane Tree sensitivity from overlapping allergies and infections.
Respiratory
- Sneezing and rhinorrhea during the 20–40-day spring pollen window
- Nasal congestion making outdoor commutes in urban corridors difficult
- Itching and irritation of the throat and nasal passages
- Worsened asthma from high-density urban pollen exposure
- Mechanical airway irritation from plane-tree bark trichomes (leaf hairs) — distinct from IgE allergy
Ocular
- Itchy, watery eyes during peak April pollen release in urban corridors
- Allergic conjunctivitis — redness and grittiness
- Periorbital swelling in heavily sensitized patients
- Exacerbation when walking under plane-tree-lined streets
Dermal
- Perioral tingling and itching after eating raw peach or hazelnut (Pla a 3 LTP syndrome)
- Urticaria from raw peanut in Pla a 3-sensitized patients
- Contact urticaria from direct contact with plane-tree pollen in highly sensitized individuals
Systemic
- Fatigue and cognitive fog from chronic April–May allergic rhinitis in city residents
- Sleep disturbance from nasal obstruction and post-nasal drip
- Systemic anaphylaxis — uncommon but documented with Pla a 3 LTP food cross-reactivity
- Exacerbation of bronchial hyperreactivity in asthmatics living near high-density plane plantings
Urban plane-tree allergy is geographically deterministic — if your patient lives in Manhattan, Madrid, or downtown San Francisco and develops new-onset April rhinitis, Platanus x acerifolia should be on the testing panel even without rural pollen exposure. The urban canopy delivers the allergen regardless of lifestyle.
When & Where London Plane Tree Peaks
Allergen intensity by month and by state. Useful for timing SCIT start dates and travel planning.
12-Month Intensity
Peak: April, with pollen release lasting 20–40 days — longer than most urban tree pollens· ~6–8 weeks; Madrid counts can exceed 1,000 grains/m³ daily at peak; urban canyon effect intensifies exposure
US Exposure Map
10 high-intensity statesExposure intensity by state (text version)
- ME:
- Low
- VT:
- Low
- NH:
- Low
- WA:
- Moderate
- MT:
- Low
- ND:
- Low
- MN:
- Low
- WI:
- Low
- MI:
- Moderate
- NY:
- High
- MA:
- High
- OR:
- Moderate
- ID:
- Low
- WY:
- Low
- SD:
- Low
- IA:
- Low
- IL:
- High
- IN:
- Moderate
- OH:
- High
- PA:
- High
- NJ:
- High
- CT:
- Moderate
- RI:
- Moderate
- CA:
- High
- NV:
- Low
- UT:
- Low
- CO:
- Low
- NE:
- Low
- MO:
- Low
- KY:
- Moderate
- WV:
- Low
- VA:
- High
- MD:
- High
- DE:
- Moderate
- AZ:
- Low
- NM:
- Low
- KS:
- Low
- AR:
- Low
- TN:
- Moderate
- NC:
- Moderate
- SC:
- Low
- OK:
- Low
- LA:
- Low
- MS:
- Low
- AL:
- Low
- GA:
- Moderate
- TX:
- Low
- FL:
- Low
- AK:
- Low
- HI:
- Low
What London Plane Tree Cross-Reacts With
Patients sensitized to one allergen often react to others sharing similar proteins. This map shows the documented molecular overlaps.
London plane pollen cross-reacts via the same three pathways as American sycamore: Pla a 1 and Pla a 2 are pollen-specific allergens recognized by most sensitized individuals, while Pla a 3 (nsLTP) drives heat-stable cross-reactivity with stone fruits, hazelnut, and peanut.
Near-complete allergen identity — both are Platanus species sharing Pla a 1, Pla a 2, and Pla a 3
Pla a 3 nsLTP cross-reacts with peach Pru p 3; heat-stable, can cause systemic reactions
Pla a 3 cross-reacts with peanut Ara h 9 (nsLTP); screen before SCIT initiation
Pla a 3 LTP cross-reactivity with hazelnut Cor a 8; reactions may be systemic not just oral
Plane Tree – Peach – Peanut – Hazelnut LTP Syndrome
Pla a 3, the nsLTP of London plane pollen, cross-reacts with stone-fruit and nut nsLTPs (Pru p 3 in peach, Ara h 9 in peanut, Cor a 8 in hazelnut). Unlike PR-10-based OAS, the nsLTP reactions are heat-stable and do not disappear with cooking — reactions range from oral tingling to systemic anaphylaxis. Pla a 3 status must be established before initiating SCIT maintenance dosing.
Is SCIT Right for Your London Plane Tree Allergy?
Answer five questions to assess whether london plane tree allergy shots are the right next step for your April rhinitis.
How severe are your London plane or spring tree-pollen symptoms each April?
The London Plane Tree SCIT Protocol
London plane SCIT uses non-standardized aqueous Platanus extract following the standard build-up and maintenance schedule; given the well-characterized Pla a allergen triad, a molecular pre-screen (Pla a 3 status) before the first injection is strongly recommended by current practice.
Starting from the most dilute vial (1:100,000 w/v with Curex — a more conservative starting point than the textbook 1:10,000), the allergist incrementally increases the extract concentration at each visit. The 30-minute post-injection observation period is mandatory. If a large local reaction or any systemic sign occurs, the allergist will adjust the dose schedule. Pre-season initiation (fall or winter) allows build-up to be completed before the April–May peak.
The target maintenance concentration (1:100 w/v) is administered on an individualized maintenance schedule. Most patients notice meaningful symptom reduction during their second or third April on maintenance SCIT. European Platanus SCIT data (Subiza et al., Allergol Immunopathol 1994) demonstrate clinical benefit that is consistent with practice-parameter-level evidence.
After a complete 3–5 year course, many patients retain symptom benefit for 7–12 additional years without injections. Patients with comorbid asthma or severe Pla a 3 sensitization may benefit from longer maintenance.
Extract Concentration Ladder
You progress through each vial during build-up. Concentration increases ~10x per step.
What the Research Shows for London Plane Tree SCIT
London plane (Platanus × acerifolia) is the source species for all published Pla a allergen data and the closest to an evidence-based SCIT target in the Platanus genus; Curex component-resolved IgE testing can confirm Pla a 1 and Pla a 2 sensitization and stratify Pla a 3 LTP risk before initiating European-evidence-based SCIT.
- IgE reactivity to Pla a 2 (polygalacturonase) in sensitized patients76%Asturias et al., Clin Exp Allergy 2002 — Madrid plane-pollen cohort
- Pla a 1 + Pla a 2 combined recognition in Platanus-allergic patients80%Enrique et al., J Investig Allergol Clin Immunol 2002 — combined allergen recognition data
- Clinical symptom improvement in EU Platanus SCIT study60%Subiza et al., Allergol Immunopathol 1994 — Spanish plane-pollen SCIT controlled study
- Platanus sensitization rising in urban EU populations per decade3%D'Amato et al., Allergy 2007 — urban sensitization trend data (2–3% per decade)
London plane is the best-characterized Platanus species for clinical immunology, with three IUIS-named allergens and European SCIT studies demonstrating symptom reduction. No US RCT has been conducted, so clinical practice in the US extrapolates from EU data and the AAAAI Practice Parameter (Cox et al., JACI 2011; Greenhawt et al., Ann Allergy Asthma Immunol 2023). The rising prevalence of urban Platanus sensitization and the 20–40-day season with no avoidance option make SCIT a compelling option for confirmed sensitized urban patients.
Ready to skip the surprise bills?
At-home allergy shots (SCIT) are designed by board-certified allergists. See the listed SCIT plan rate in our pricing record and request a quote for eligibility, initiation and total care costs.
- MD-ledBoard-certified allergists
- QuoteTotal care estimate
- 50K+Patients treated
- HSA/FSAEligible
London Plane Tree SCIT Side Effects
London plane SCIT side effects are consistent with the standard inhalant SCIT safety profile; local injection-site reactions are expected and manageable, while systemic reactions are rare when proper 30-minute post-injection observation is maintained.
Local reactions
4 documented| Reaction | Rate | Severity |
|---|---|---|
Injection-site swelling and erythema Expected during build-up; resolves within 1–2 hours; ice application helpful | Rate 30–50% | Mild |
Pruritus at injection site Normal histamine response; antihistamine pre-medication may reduce incidence | Rate 25–40% | Mild |
Large local reaction (>5 cm induration) Triggers dose adjustment at next visit; cold compress and topical steroid can help | Rate 5–10% | Moderate |
Persistent nodule at injection site Resolves over 24–48 hours; aluminum adjuvant-free extracts reduce risk | Rate 2–5% | Mild |
Systemic reactions
4 documented| Reaction | Rate | Severity |
|---|---|---|
Generalized urticaria Requires immediate treatment and dose review; epinephrine on hand at all visits | Rate 0.1–0.5% per injection | Moderate |
Rhinitis or conjunctivitis flare Usually manageable with standard antiallergic medications | Rate 0.1–0.3% per injection | Mild |
Bronchospasm in patients with asthma Peak flow monitoring recommended; spirometry control required before each injection | Rate 0.05–0.1% per injection | Moderate |
Anaphylaxis the first injection from each new vial or concentration is supervised live in the Virtual Shot Room by trained Curex clinical staff, with a prescribed epinephrine auto-injector confirmed on-hand before the first dose | Rate <0.01% per injection | Severe |
Anaphylaxis to plane-tree SCIT has been reported in the literature but remains rare with proper dose escalation protocols. The 30-minute observation requirement is non-negotiable; no exception for experienced SCIT patients.
SCIT vs Alternatives for London Plane Tree
London plane-allergic urban patients have four main options; SCIT is the only disease-modifying treatment and uniquely suited to patients who cannot avoid their exposure setting (urban streets).
| Criterion | At-home SCIT (Curex)Best | SLIT Drops | Avoidance | Medications |
|---|---|---|---|---|
| Effectiveness | Strong (EU RCT data) | Moderate (extrapolated) | Minimal (impossible in cities) | Symptom control only |
| 5-yr cost | $3,500–$15,000 | $1,500–$4,000 | $0–$500/yr | $200–$1,200/yr |
| Duration | 3–5 years | 3–5 years | Indefinite | Indefinite |
| Convenience | Weekly then monthly at home | Daily at home | Infeasible urban commuters | Daily pills/sprays |
| Safety | Virtual Shot Room–supervised first dose | Self-administered | No medical risk | Generally safe |
| Lasting effect | 7–12 yrs post-course | Ongoing use needed | No lasting change | No lasting change |
At-home SCIT (Curex)Best
SLIT Drops
Avoidance
Medications
For urban residents with confirmed London plane sensitization, SCIT is the most evidence-based path to lasting relief, and Curex delivers it at home with pricing confirmed in a current program quote so patients who cannot commit to clinic visits still get the disease-modifying option: sterile-compounded serum, a prescribed epinephrine auto-injector confirmed on-hand, and a first injection supervised live in the Virtual Shot Room by trained Curex clinical staff — appropriate for confirmed Platanus-driven rhinitis once Pla a 3 LTP food syndrome has been evaluated.
What London Plane Tree SCIT Actually Costs
Most major US health insurers cover London plane SCIT under standard allergy immunotherapy benefit codes when prescribed by a board-certified allergist with documented IgE sensitization. Urban residents should verify network allergists who routinely test for Platanus — it is not on every standard panel. Prior authorization requirements vary by insurer and plan type.
Cost range varies by deductible, co-insurance, and clinic.
Verify these codes with your insurer to confirm coverage.
See the listed Environmental Allergy Shots Plan rate, commercial terms dated 2026-10-12; consultations are included without copay. Confirm availability, eligibility, other included services, testing, any in-person care, insurance responsibility and billing cadence in your written quote before enrolling.
Join the waitlistStop guessing about your london plane tree allergy. Get a plan.
Take Curex’s 3-minute allergy quiz. A board-certified allergist will review your symptoms and recommend the right immunotherapy path for you — shots or drops.
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London Plane Tree SCIT — Frequently Asked
Quick answers to the questions patients ask most before starting treatment.
London plane is one of the most-planted municipal street trees in major cities (New York, San Francisco, Madrid, London, Milan) because of its pollution tolerance and bark-shedding habit. This intentional mass urban planting creates what aerobiologists call 'pollen alleys' — dense corridors where pedestrians cannot avoid pollen exposure for the full 20–40-day spring release window. In rural settings where Platanus species grow sporadically rather than in planted rows, pollen counts are insufficient to drive wide sensitization. Paradoxically, the tree's cultivation success in dense urban environments is the primary driver of the allergy burden it creates. Climate change has further extended the pollen season and increased annual pollen load per Anderegg et al. (PNAS 2021).
Pla a 3 is a non-specific lipid transfer protein (nsLTP) from London plane pollen. Unlike the more common PR-10 (birch-type) allergen that drives oral allergy syndrome only for raw foods and is destroyed by cooking, Pla a 3 is heat-stable — reactions to peach, hazelnut, and peanut in Pla a 3-sensitized patients can occur with cooked foods and can be systemic (hives, throat tightening, anaphylaxis) rather than limited to mouth tingling. Before initiating SCIT maintenance dosing, a board-certified allergist should establish your Pla a 3 status via specific IgE testing, because Pla a 3-positive patients carry a different food allergy risk profile that requires separate counseling and epinephrine prescription.
Yes, in most cases. SCIT using Platanus extract is billed under standard immunotherapy CPT codes (95115, 95117, 95165), which are covered by most major commercial insurance plans and Medicare Part B when prescribed by a board-certified allergist with documented sensitization. Prior authorization is commonly required, and some payers require documented failure of pharmacotherapy (antihistamines plus intranasal corticosteroids for at least 6–12 months) before approving immunotherapy. The specific IgE testing needed to establish Platanus sensitization and Pla a 3 LTP status is billed separately under diagnostic codes and is typically also covered under standard allergy benefit provisions.
Most patients notice some reduction in symptoms during the first spring season on maintenance SCIT, but meaningful benefit is more consistently observed in the second and third spring seasons. The build-up phase of 4–6 months should ideally be completed before the April–May peak, so starting SCIT in the late summer or fall gives the best chance of reaching maintenance before the following spring. A board-certified allergist will set expectations for your specific case — some patients with severe sensitization or comorbid asthma may take longer to see full benefit.
Absolutely — urban residence does not preclude SCIT and in fact is the primary reason many urban patients pursue it. The shots are designed to be given at a clinic and require a 30-minute post-injection wait, which most urban patients accommodate with a nearby allergy office. In a large safety study of self-administered allergen immunotherapy (Schaffer et al., 2015), the systemic reaction rate was just 0.16% per patient across 23,614 patients giving 2,021,600 injections, with no fatalities — lower than the 3%–14% typically seen with office-based shots. During the build-up phase, you may experience somewhat more intense pollen exposure than patients who can avoid it during dose escalation; your allergist may recommend pre-season timing (fall or winter start) to complete the riskier build-up phase before peak pollen. Some adjunctive measures — HEPA air purifiers at home, showering after commuting, keeping windows closed during peak April mornings — provide additional symptom control while SCIT develops its effect.
Clinically, they are nearly indistinguishable. London plane (Platanus × acerifolia) is the hybrid of American sycamore (P. occidentalis) and Oriental plane (P. orientalis), and all three share the same Pla a 1, Pla a 2, and Pla a 3 allergen profile. The Madrid allergy cohort that characterized these allergens used London plane pollen specifically, but the data apply to all Platanus species. The main practical difference is geographic: American sycamore is the native species of eastern river corridors, while London plane is the cultivated urban street tree planted in major cities worldwide. Patients sensitized to one species are sensitized to all others in the genus.
Evidence from the broader SCIT literature — not specifically London plane trials — supports that tree-pollen SCIT can reduce bronchial hyperreactivity and asthma exacerbations in patients whose asthma is driven by pollen sensitization. The AAAAI Practice Parameter (Cox et al., JACI 2011) includes asthma as a recognized indication for allergen immunotherapy when the asthma is not severe and is controlled at the time of injection. For Platanus-sensitized patients with comorbid asthma, spirometry control is required before each SCIT visit, and any active bronchospasm requires dose deferral. A board-certified allergist and pulmonologist should coordinate care for patients with significant asthma.
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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