Rabbit Allergy Shots: Ory c 3, the Anti-Cat Secretoglobin Finding, and LAA
Rabbit has the most counterintuitive negative cross-reactivity finding in pet allergy: Ory c 3 is the second mammalian secretoglobin ever identified (after cat Fel d 1), sensitizing 77% of rabbit-allergic patients, yet there is NO IgE cross-reactivity between them (Hilger et al., JACI 2014). Rabbit SCIT evidence is sparse; no FDA-standardized extract exists.
Rabbit Allergy Immunotherapy: How It Works
Allergy immunotherapy is the only long-term treatment that re-trains the immune system to stop overreacting to rabbit — rather than just masking symptoms with antihistamines or steroids. By gradually exposing the body to controlled doses of rabbit 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 rabbit 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 rabbit 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 rabbit 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
Allergy Drops / Tablets (SLIT)
Daily drops or dissolvable tablets containing rabbit 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 rabbit 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 rabbit allergy with at-home drops, see how Curex sublingual immunotherapy compares below.
What is Rabbit?
The biology, taxonomy, and clinical fingerprint of Rabbit — the foundation of how SCIT targets it.
Ory c 3 is the only mammalian secretoglobin allergen besides cat Fel d 1 — yet the two do NOT cross-react, despite structural homology. This critical negative finding means cat-allergic patients can generally tolerate rabbits without cross-reactive symptoms.
- Scientific name
- Oryctolagus cuniculus
- Family
- LeporidaeRabbit family
- Type
- Household pet, laboratory animal, and food-animal allergen
- Native to
- Iberian Peninsula; domesticated ~1,400 years ago by Frankish monks; now globally distributed
- Allergen proteins
- Ory c 1 — 17-18 kDa lipocalin from saliva and urineOry c 3 (major) — 18-19 kDa secretoglobin from hair and dander; sensitizes 77% of rabbit-allergic patients (Hilger et al., JACI 2014); SECOND mammalian secretoglobin allergen identified after cat Fel d 1Ory c 4 — lipocalin with 51-54% identity to mouse Mus m 1 and rat Rat n 1; provides cross-reactivity with rodentsCRITICAL: Ory c 3 and Fel d 1 are both secretoglobins but do NOT cross-react — negative IgE cross-reactivity confirmed (Hilger et al., 2014)
- Particle size
- Urine-derived particles are the dominant aerosolized allergen source; dander particles also contribute via Ory c 3
- Avoidance difficulty
- Moderate
How Rabbit Allergy Presents
Symptoms by body system — useful for distinguishing Rabbit sensitivity from overlapping allergies and infections.
Respiratory
- Rhinitis and nasal congestion after rabbit contact — a common first symptom in pet rabbit owners
- Asthma exacerbations in sensitized individuals with bedroom-cage rabbit exposure
- Occupational asthma in laboratory workers who progress from rhinitis with continued rabbit exposure (4-22% progression rate)
- Perennial respiratory symptoms in households where rabbit cage is in the living space
- Mean 7 months to nasal symptom onset in laboratory workers; rapid progression in atopic individuals
Ocular
- Conjunctivitis during and after rabbit handling or cage cleaning
- Eye itching and lacrimation from direct allergen contact
- Periorbital swelling in sensitized individuals with concentrated exposure
- Ocular symptoms accompanying nasal reactions in classic LAA presentation
Dermal
- Contact urticaria at rabbit scratch or bite sites in sensitized individuals
- Hive formation after handling rabbit fur or bedding
- Atopic dermatitis flare in pediatric patients with regular rabbit contact
- Skin sensitization from grooming and handling — especially relevant for angora rabbit breeders
Systemic
- Fatigue from chronic perennial rhinitis in households with rabbits kept indoors
- Occupational disability with career disruption in laboratory workers who develop occupational asthma
- Rarely, anaphylaxis in highly sensitized individuals with concentrated allergen challenge
- Pediatric asthma impact from unrecognized rabbit allergen in bedrooms and living areas
Rabbit allergy has one of the most counterintuitive findings in pet allergy: the rabbit secretoglobin Ory c 3 looks structurally like cat Fel d 1, but it doesn't cross-react. A cat-allergic patient can usually tolerate a rabbit. That surprises people. The clinical question with rabbit allergy is usually about laboratory workers — 30% sensitization rate is not small — or committed pet owners who decline rehoming.
Where Rabbit Triggers Year-Round
Rabbit is a perennial trigger — exposure is constant for sensitized patients. Geographic intensity still varies by climate.
12-Month Intensity
Year-roundPerennial year-round — no seasonal variation for household pet or laboratory rabbit exposure.· Year-round for both household pet and laboratory animal settings.
US Exposure Map
20 high-intensity statesWhat Rabbit Cross-Reacts With
Patients sensitized to one allergen often react to others sharing similar proteins. This map shows the documented molecular overlaps.
Rabbit's cross-reactivity profile is defined by a critically important NEGATIVE finding (Ory c 3 does NOT cross-react with cat Fel d 1 despite being both secretoglobins) and by Ory c 4's positive cross-reactivity with mouse and rat lipocalins.
Ory c 4 ↔ Rat n 1 lipocalin (~54% identity) — cross-reactivity between rabbit and rat via lipocalin family
Ory c 4 ↔ Mus m 1 lipocalin (51-54% identity) — cross-reactivity between rabbit and mouse via lipocalin family
Rabbit serum albumin cross-reactivity with Can f 3 expected by mammalian albumin homology
Is SCIT Right for Your Rabbit Allergy?
Answer five questions to assess your rabbit allergy situation and whether immunotherapy is appropriate for your specific context.
How severe are your rabbit allergy symptoms?
The Rabbit SCIT Protocol
Rabbit SCIT uses non-FDA-standardized epithelial extract. No RCT data exists. SCIT is primarily considered for laboratory workers who cannot leave their profession or committed pet owners who decline rehoming.
Standard inhalant SCIT build-up. For laboratory workers, NIOSH 97-116 engineering controls (IVCs, HEPA filtration, 10-15 air changes/hour, N95 during cage changes) should be in place concurrently. Component testing confirming Ory c 1 and Ory c 3 sensitization before starting is recommended. 30-minute post-injection observation is mandatory.
Maintenance injections continue alongside ongoing occupational or pet-management environmental controls. Regular clinical monitoring for patients with asthma comorbidity. Because rabbit SCIT evidence is extrapolated rather than RCT-based, clinical response monitoring is particularly important.
Workers who change to non-animal-handling roles and pet owners whose rabbits have died and who do not acquire new animals may achieve lasting remission. Extended maintenance may be appropriate for ongoing high-exposure occupational settings.
Extract Concentration Ladder
You progress through each vial during build-up. Concentration increases ~10x per step.
What the Research Shows for Rabbit SCIT
No double-blind placebo-controlled RCT for rabbit SCIT has been published. Evidence is based on occupational LAA cohort data and general Practice Parameter extrapolation.
- Rabbit-exposed laboratory worker symptom rate30%Aoyama K et al., Br J Ind Med 1992; >5,000 workers across multiple species
- Ory c 3 sensitization rate in rabbit-allergic patients77%Hilger C et al., J Allergy Clin Immunol 2014; Ory c 3 as the second mammalian secretoglobin allergen
No DBPC-RCT for rabbit SCIT is available. The most clinically significant evidence for this page is the Hilger et al. (JACI 2014) characterization of Ory c 3 and the definitive demonstration of NO IgE cross-reactivity with cat Fel d 1 — a finding with immediate clinical relevance for cat-allergic patients who wish to adopt a rabbit. SCIT for rabbit allergy is an extrapolated clinical option for laboratory workers and committed pet owners, with realistic expectations of moderate rather than dramatic benefit given the absence of allergen-specific RCT data.
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- 50K+Patients treated
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Rabbit SCIT Side Effects
Rabbit SCIT side effects follow the general inhalant SCIT profile when non-standardized epithelial extract is used.
Local reactions
4 documentedSystemic reactions
4 documentedTraditionally SCIT was given only in a clinic, but for eligible maintenance patients Curex makes safe at-home self-administration possible: a personalized serum sterile-compounded to USP <797> and lot-tested, a prescribed epinephrine auto-injector confirmed on hand before the first injection, and the first dose plus every dose change supervised live over Zoom by the prescribing allergist. Standard SCIT safety protocols apply to rabbit extract, and reactions typically begin within ~30 minutes, so a brief post-injection self-observation is advised.
SCIT vs Alternatives for Rabbit
Environmental controls (cage management, HEPA, N95 during cleaning) are the primary intervention for household rabbit allergy. SCIT is primarily indicated for laboratory workers. For pet owners, rehoming — though difficult — is the most definitive intervention.
| Criterion | SCITBest | SLIT | Rehoming | Environmental controls + medications |
|---|---|---|---|---|
| Effectiveness | Limited — no RCT; LAA rationale only | Off-label; less evidence than occupational SCIT | Complete — definitive | Significant reduction; partial relief |
| 5-yr cost | $3,500-$10,000 | $129/month | $0 | $500-$2,000/yr + controls |
| Duration | 3-5 years | 3-5 years | Permanent | Indefinite |
| Convenience | Self-administered weekly at home with Curex (build-up) | Daily drops at home | Emotionally difficult | Ongoing management required |
| Safety | Very safe; Curex confirms prescribed epinephrine on hand and supervises your first dose and every dose change live over Zoom | Very safe; no clinic required | No side effects | Generally safe |
| Lasting effect | Some sustained benefit post-course | Ongoing benefit while continuing | Permanent if strict | No lasting effect after stopping meds |
SCITBest
SLIT
Rehoming
Environmental controls + medications
For laboratory workers with confirmed Ory c sensitization who cannot leave their profession, SCIT alongside NIOSH 97-116 controls offers the best available approach. Curex delivers that immunotherapy as an at-home allergy shot at $129/month for laboratory workers and rural pet-rabbit owners whose schedules or clinic access make weekly injections impractical — a personalized serum sterile-compounded to USP <797> and lot-tested, a prescribed epinephrine auto-injector confirmed on hand before the first injection, and the first dose plus every dose change supervised live over Zoom by the prescribing allergist, with a prescribed epinephrine auto-injector confirmed on hand.
What Rabbit SCIT Actually Costs
Coverage for rabbit allergen SCIT depends on documented IgE sensitization and medical necessity as certified by a board-certified allergist. Most major insurers cover occupational allergen immunotherapy under standard allergy benefits. Pet-rabbit allergy coverage may be more variable. Out-of-pocket costs depend on deductible and co-insurance structure. Curex at-home IgE testing identifies specific rabbit sensitization before allergist consultations, eliminating the need for an initial skin-test visit.
Cost range varies by deductible, co-insurance, and clinic.
Verify these codes with your insurer to confirm coverage.
Flat monthly subscription — includes consult, prescription, and at-home dosing for sublingual immunotherapy.
See if you qualifyStop guessing about your rabbit 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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Rabbit SCIT — Frequently Asked
Quick answers to the questions patients ask most before starting treatment.
Probably not — and this is the most important and counterintuitive finding in rabbit allergy science. Ory c 3, the major rabbit allergen sensitizing 77% of rabbit-allergic patients, is a secretoglobin — the same protein family as cat Fel d 1. Despite this structural homology, Hilger et al. (JACI 2014) definitively confirmed no IgE cross-reactivity between Ory c 3 and Fel d 1. Cat-sensitized patients generally do not cross-react to rabbit secretoglobin. In clinical practice, cat-allergic patients are routinely counseled that a rabbit is a reasonable pet choice from an allergen cross-reactivity perspective. The exception is if a patient is sensitized to Ory c 4 (the rabbit lipocalin), which cross-reacts with mouse and rat but not specifically with cat — independent cat allergy should be confirmed separately by a board-certified allergist.
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.