Seasonal Allergy Injection: Same SCIT, Different Allergen Targets
A seasonal allergy injection is not a special 'seasonal' formulation — it is standard subcutaneous immunotherapy (SCIT) with an extract prescription targeting the patient's regional seasonal aeroallergens (grass, ragweed, or tree pollens). The injection schedule is perennial (year-round), not seasonal-only. US grass-pollen SCIT: Cochrane 51 RCTs SMD -0.73 (Calderón 2007). The SCIT course still lasts 3-5 years regardless of which seasonal allergens are targeted.
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A seasonal allergy injection is standard SCIT formulated for the patient's confirmed seasonal sensitizations — typically grass, ragweed, or tree pollens. There is no separate 'seasonal' SCIT product; the injection schedule remains year-round for 3-5 years.
The essentials
A seasonal allergy injection is standard subcutaneous immunotherapy (SCIT) — not a distinct product or a short-course seasonal treatment. The 'seasonal' descriptor refers to the patient's sensitization profile (seasonal aeroallergens: grass pollens, short ragweed, tree pollens), not to a different formulation or a different dosing schedule per Cox 2011 Practice Parameter (Cox L, Nelson H, Lockey R et al., J Allergy Clin Immunol 2011;127(1 Suppl):S1-S55, DOI 10.1016/j.jaci.2010.09.034).
Key myth to correct: SCIT is administered perennially (year-round) in US clinical practice — patients receive injections during the off-season to build tolerance, so they are at or near the maintenance dose when their peak pollen season arrives. There is no widely used 'pre-seasonal short course' SCIT protocol in the US; that approach is far more common in Europe.
Curex's at-home IgE blood test with allergist review identifies which seasonal aeroallergens — tree, grass, or weed pollens — are actually driving symptoms, so the immunotherapy prescription targets the relevant pollens, not the patient's geographic guess.
The seasonal allergen landscape that SCIT can target:
FDA-standardized grass pollens (8 species, BAU/mL units): Bermuda, Kentucky Bluegrass, Meadow Fescue, Orchard, Perennial Rye, Redtop, Sweet Vernal, Timothy. Peak season May-July in most US regions.
Short ragweed (Ambrosia artemisiifolia): FDA-standardized, potency by Amb a 1 content. Peak August-October. Creticos PS et al. (N Engl J Med 1996;334:501-506) established SCIT efficacy for ragweed-sensitized adults.
Tree pollens (oak, birch, maple, elm, alder, mountain cedar): FDA-licensed but NOT standardized; labeled in PNU/mL or w/v. Mountain cedar SCIT is regionally important (central Texas) but under-studied. Peak February-May for most species.
Outdoor molds (Alternaria, Cladosporium): FDA-licensed but not standardized. High-protease extracts must be kept in separate vials from pollen extracts per Cox 2011 mixing principles. Only Alternaria has RCT evidence for SCIT (Kuna P et al., J Allergy Clin Immunol 2011;127:937-944).
Pollen season timing varies by US region and is changing due to climate: Anderegg WRL et al. (PNAS 2021;118:e2013284118) reported the North American pollen season lengthened by approximately 20 days from 1990-2018, with pollen loads increasing 21% — extending the relevance of SCIT for seasonal sensitizations.
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See if at-home shots are right for youFrequently asked questions
Is there a seasonal allergy injection that only works for spring or fall?
No. SCIT (subcutaneous immunotherapy) for seasonal allergies uses standard allergen extracts from the patient's confirmed sensitizations — grass pollens for spring/early summer, ragweed for fall, tree pollens for late winter/spring. The extract targets the patient's specific seasonal sensitizations, but the injection schedule is perennial (year-round) in US practice: patients continue injections throughout the year to maintain the maintenance dose level. There is no 'spring formula' or 'fall formula' — only the allergen sources in the vial differ based on which seasonal pollens are sensitizing.
How is seasonal SCIT different from perennial SCIT?
Seasonal SCIT and perennial SCIT are not different products — the difference is in the allergen content of the custom-compounded vial. Seasonal SCIT targets grass pollens, ragweed, or tree pollens (allergens with defined pollen seasons). Perennial SCIT typically targets dust mites, cat dander, or dog dander (allergens present year-round). Many patients have both seasonal and perennial sensitizations and receive a multi-allergen vial addressing both categories. The injection schedule — perennial, year-round, with build-up and maintenance phases — is the same for both. US practice does not use a 'pre-seasonal' short-course SCIT schedule; that approach is more common in Europe.
What is the evidence for grass-pollen allergy shots?
Grass-pollen SCIT has the strongest evidence base in the field. Cochrane meta-analysis (Calderón MA et al., 2007, DOI 10.1002/14651858.CD001936.pub2) across 51 RCTs and 2,871 patients found a symptom SMD of -0.73 (95% CI -0.97 to -0.50) and a medication SMD of -0.57. Durham SR et al. (N Engl J Med 1999;341:468-475) demonstrated disease-modifying remission persisting for years after a 3-4 year grass-pollen SCIT course ended. The 8 FDA-standardized grass pollens (Bermuda, Kentucky Bluegrass, Meadow Fescue, Orchard, Perennial Rye, Redtop, Sweet Vernal, Timothy) provide consistent, lot-to-lot potency per FDA CBER reference standards.
What is the evidence for ragweed allergy shots?
Ragweed SCIT has a strong evidence base. Creticos PS et al. (N Engl J Med 1996;334:501-506) demonstrated approximately 85% symptom score reduction in ragweed-sensitized adults. Short ragweed is one of 19 FDA-standardized allergen extracts, potency measured by Amb a 1 content. Ragwitek is the FDA-approved sublingual tablet for ragweed allergy — it confirms that the allergen-specific tolerance mechanism is well-established for ragweed, whether delivered sublingually or via subcutaneous injection (SCIT). Ragweed season in the US runs approximately August-October, with peak concentration in most regions in mid-September.
Do I need year-round allergy shots for seasonal allergies?
Yes — US SCIT practice is perennial (year-round), not seasonal-only, even for patients whose sensitizations are exclusively seasonal. Patients continue maintenance injections throughout the year because the immunological reprogramming requires consistent allergen exposure. Skipping injections outside pollen season would require restarting from an earlier build-up dilution and would delay achieving the maintenance-dose tolerance that makes SCIT effective during peak season. The goal is to be at the full maintenance dose before pollen season begins — which requires year-round injections to maintain that level.
Will climate change affect my seasonal allergy shots?
Climate change is extending pollen seasons and increasing pollen loads, which may affect when seasonal allergy symptoms peak and how long high-sensitization seasons last. Anderegg WRL et al. (PNAS 2021;118:e2013284118) reported the North American pollen season lengthened by approximately 20 days from 1990-2018, with pollen loads increasing 21%. For SCIT patients, the allergen-specific targets in their extract vials do not change — the same FDA-standardized grass or ragweed extracts are used regardless of season length. However, patients in changing-climate regions may find their symptomatic periods extending, reinforcing the value of year-round maintenance immunotherapy that provides coverage throughout an extended pollen season.
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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.